From 62f9d53a4300c8ef14bd65435b50ff91db5a73c4 Mon Sep 17 00:00:00 2001
From: Robert Clabough <robert@clabough.tech>
Date: Wed, 5 Aug 2026 10:18:11 -0700
Subject: [PATCH] Add ages to age ratings

---
 server/i18n/locales/de.json                  |   6 +
 server/i18n/locales/en_pirate.json           |   6 +
 server/i18n/locales/en_us.json               |   6 +
 server/i18n/locales/fr.json                  |   6 +
 server/i18n/locales/pl.json                  |   6 +
 server/pages/admin/users/groups/[id].vue     | 238 ++++++++++++++-----
 server/server/internal/metadata/giantbomb.ts |  26 +-
 server/server/internal/metadata/igdb.ts      |  74 +++---
 server/server/internal/metadata/steam.ts     |   4 +-
 server/utils/ageRatings.ts                   | 142 ++++++++---
 10 files changed, 363 insertions(+), 151 deletions(-)

diff --git a/server/i18n/locales/de.json b/server/i18n/locales/de.json
index 9d9a6abf..07f46712 100644
--- a/server/i18n/locales/de.json
+++ b/server/i18n/locales/de.json
@@ -717,6 +717,12 @@
         "removeBannedRating": "Entfernen",
         "removeMember": "Entfernen",
         "title": "Benutzergruppen",
+        "maximumContentAge": "Altersbeschränkung",
+        "maximumContentAgeDescription": "Legen Sie das maximale Inhaltsalter für Mitglieder dieser Gruppe fest. Bewertungen über diesem Alter werden gesperrt.",
+        "applyAgeRestriction": "Altersbeschränkung anwenden",
+        "advancedOverrides": "Erweitert: Manuelle Überschreibungen",
+        "manualOverrideNote": "Die aktuellen gesperrten Bewertungen entsprechen keiner Standard-Altersschwelle. Sie wurden möglicherweise manuell konfiguriert.",
+        "sliderOverrideWarning": "Das manuelle Hinzufügen oder Entfernen von Bewertungen überschreibt den Schieberegler. Verwenden Sie den obigen Schieberegler, um auf eine Standard-Altersschwelle zurückzusetzen.",
         "unratedNote": "Spiele ohne Alterseinstufung werden für Benutzer in dieser Gruppe ebenfalls ausgeblendet."
       },
       "normalUserLabel": "Normaler Benutzer",
diff --git a/server/i18n/locales/en_pirate.json b/server/i18n/locales/en_pirate.json
index 2201b510..c9cf7d5f 100644
--- a/server/i18n/locales/en_pirate.json
+++ b/server/i18n/locales/en_pirate.json
@@ -516,6 +516,12 @@
         "removeBannedRating": "Remove",
         "removeMember": "Cast overboard",
         "title": "Crew Groups",
+        "maximumContentAge": "Age Restriction",
+        "maximumContentAgeDescription": "Set the maximum content age fer members of this crew. Ratings above this age be banned, arr!",
+        "applyAgeRestriction": "Apply age restriction",
+        "advancedOverrides": "Advanced: Manual Overrides",
+        "manualOverrideNote": "The current banned ratings don't match a standard age threshold. They may've been manually set by the captain.",
+        "sliderOverrideWarning": "Manually addin' or removin' ratings here will override the slider. Use the slider above to reset to a standard age threshold.",
         "unratedNote": "Unrated plunder will also be hidden from scallywags in this crew."
       },
       "normalUserLabel": "Common crewman",
diff --git a/server/i18n/locales/en_us.json b/server/i18n/locales/en_us.json
index 3352f2a0..e04a778e 100644
--- a/server/i18n/locales/en_us.json
+++ b/server/i18n/locales/en_us.json
@@ -835,6 +835,12 @@
         "removeBannedRating": "Remove",
         "removeMember": "Remove",
         "title": "User Groups",
+        "maximumContentAge": "Age Restriction",
+        "maximumContentAgeDescription": "Set the maximum content age allowed for members of this group. Ratings above this age will be banned.",
+        "applyAgeRestriction": "Apply age restriction",
+        "advancedOverrides": "Advanced: Manual Overrides",
+        "manualOverrideNote": "The current banned ratings do not match a standard age threshold. They may have been manually configured.",
+        "sliderOverrideWarning": "Manually adding or removing ratings here will override the slider. Use the slider above to reset to a standard age threshold.",
         "unratedNote": "Games without age ratings will also be hidden from users in this group."
       },
       "normalUserLabel": "Normal user",
diff --git a/server/i18n/locales/fr.json b/server/i18n/locales/fr.json
index 4fc8f23c..b70c6b0e 100644
--- a/server/i18n/locales/fr.json
+++ b/server/i18n/locales/fr.json
@@ -717,6 +717,12 @@
         "removeBannedRating": "Retirer",
         "removeMember": "Retirer",
         "title": "Groupes d'utilisateurs",
+        "maximumContentAge": "Restriction d'âge",
+        "maximumContentAgeDescription": "Définissez l'âge maximum du contenu autorisé pour les membres de ce groupe. Les classifications au-dessus de cet âge seront interdites.",
+        "applyAgeRestriction": "Appliquer la restriction d'âge",
+        "advancedOverrides": "Avancé : Remplacements manuels",
+        "manualOverrideNote": "Les classifications interdites actuelles ne correspondent pas à un seuil d'âge standard. Elles ont peut-être été configurées manuellement.",
+        "sliderOverrideWarning": "L'ajout ou la suppression manuelle de classifications remplacera le curseur. Utilisez le curseur ci-dessus pour revenir à un seuil d'âge standard.",
         "unratedNote": "Les jeux sans classification d'âge seront également masqués pour les utilisateurs de ce groupe."
       },
       "normalUserLabel": "Utilisateur normal",
diff --git a/server/i18n/locales/pl.json b/server/i18n/locales/pl.json
index 2b5c11ff..8c9ae7b8 100644
--- a/server/i18n/locales/pl.json
+++ b/server/i18n/locales/pl.json
@@ -693,6 +693,12 @@
         "removeBannedRating": "Usuń",
         "removeMember": "Usuń",
         "title": "Grupy użytkowników",
+        "maximumContentAge": "Ograniczenie wiekowe",
+        "maximumContentAgeDescription": "Ustaw maksymalny wiek treści dozwolony dla członków tej grupy. Oceny powyżej tego wieku zostaną zablokowane.",
+        "applyAgeRestriction": "Zastosuj ograniczenie wiekowe",
+        "advancedOverrides": "Zaawansowane: Ręczne zastępowanie",
+        "manualOverrideNote": "Obecne zablokowane oceny nie odpowiadają standardowemu progowi wiekowemu. Mogły zostać skonfigurowane ręcznie.",
+        "sliderOverrideWarning": "Ręczne dodawanie lub usuwanie ocen zastąpi suwak. Użyj suwaka powyżej, aby powrócić do standardowego progu wiekowego.",
         "unratedNote": "Gry bez kategorii wiekowej będą również ukryte przed użytkownikami w tej grupie."
       },
       "normalUserLabel": "Normalny użytkownik",
diff --git a/server/pages/admin/users/groups/[id].vue b/server/pages/admin/users/groups/[id].vue
index b9878af5..09e4b350 100644
--- a/server/pages/admin/users/groups/[id].vue
+++ b/server/pages/admin/users/groups/[id].vue
@@ -111,93 +111,181 @@
       </div>
     </div>
 
-    <!-- Banned Ratings Section -->
+    <!-- Age Restriction Slider Section -->
     <div class="mt-8 rounded-lg border border-zinc-800 bg-zinc-900 p-6">
       <h2 class="text-base font-semibold text-zinc-100 mb-4">
-        {{ $t("users.admin.groups.bannedRatings") }}
+        {{ $t("users.admin.groups.maximumContentAge") }}
       </h2>
+      <p class="text-sm text-zinc-400 mb-4">
+        {{ $t("users.admin.groups.maximumContentAgeDescription") }}
+      </p>
       <p class="text-sm text-zinc-400 mb-4">
         {{ $t("users.admin.groups.unratedNote") }}
       </p>
 
       <div
-        v-if="group.bannedAgeRatings.length === 0 && !showAddRating"
-        class="text-sm text-zinc-400"
+        v-if="hasManualOverrides"
+        class="mb-4 rounded-md bg-yellow-900/30 border border-yellow-700/50 p-3"
       >
-        {{ $t("users.admin.groups.noBannedRatings") }}
+        <p class="text-sm text-yellow-300">
+          {{ $t("users.admin.groups.manualOverrideNote") }}
+        </p>
       </div>
 
-      <div class="space-y-2">
-        <div
-          v-for="(br, idx) in group.bannedAgeRatings"
-          :key="br.id"
-          class="flex items-center gap-2"
-        >
+      <div class="max-w-md">
+        <div class="flex items-center justify-between mb-2">
           <!-- eslint-disable-next-line @intlify/vue-i18n/no-raw-text -->
-          <span
-            class="inline-flex items-center rounded-full bg-zinc-800 px-2.5 py-0.5 text-sm font-medium text-zinc-100"
-          >
-            {{ br.organization }}: {{ br.rating }}
+          <span class="text-sm font-medium text-zinc-100">
+            {{ sliderAge }}+
           </span>
-          <button
-            type="button"
-            class="text-red-400 hover:text-red-300 text-sm"
-            @click="removeRating(idx)"
+        </div>
+        <input
+          v-model.number="sliderAge"
+          type="range"
+          min="0"
+          max="18"
+          step="1"
+          class="w-full cursor-pointer accent-blue-600"
+        />
+        <!-- eslint-disable @intlify/vue-i18n/no-raw-text -->
+        <div class="flex justify-between text-xs text-zinc-500 mt-1">
+          <span>0</span>
+          <span>6</span>
+          <span>12</span>
+          <span>18</span>
+        </div>
+        <!-- eslint-enable @intlify/vue-i18n/no-raw-text -->
+      </div>
+
+      <div v-if="sliderBannedPreview.length > 0" class="mt-4">
+        <p class="text-sm text-zinc-400 mb-2">
+          {{ $t("users.admin.groups.bannedRatings") }}
+        </p>
+        <div class="flex flex-wrap gap-1">
+          <span
+            v-for="bp in sliderBannedPreview"
+            :key="`${bp.organization}:${bp.rating}`"
+            class="inline-flex items-center rounded-full bg-red-900/30 border border-red-700/50 px-2 py-0.5 text-xs text-red-300"
           >
-            {{ $t("users.admin.groups.removeBannedRating") }}
-          </button>
+            <!-- eslint-disable-next-line @intlify/vue-i18n/no-raw-text -->
+            {{ bp.organization }}: {{ bp.rating }}
+          </span>
         </div>
       </div>
-
-      <div v-if="showAddRating" class="mt-4 flex items-center gap-2">
-        <select
-          v-model="newRatingOrg"
-          class="rounded-md bg-zinc-800 px-2 py-1 text-sm text-zinc-100 outline outline-1 -outline-offset-1 outline-zinc-700 focus:outline-blue-600"
-        >
-          <option v-for="org in organizations" :key="org" :value="org">
-            {{ org }}
-          </option>
-        </select>
-        <select
-          v-model="newRatingValue"
-          :disabled="!newRatingOrg"
-          class="rounded-md bg-zinc-800 px-2 py-1 text-sm text-zinc-100 outline outline-1 -outline-offset-1 outline-zinc-700 focus:outline-blue-600"
-        >
-          <option v-for="r in availableRatingsForOrg" :key="r" :value="r">
-            {{ r }}
-          </option>
-        </select>
-        <button
-          type="button"
-          class="rounded-md bg-blue-600 px-2 py-1 text-sm font-semibold text-white hover:bg-blue-500"
-          :disabled="!newRatingOrg || !newRatingValue"
-          @click="addRating"
-        >
-          {{ $t("add") }}
-        </button>
-        <button
-          type="button"
-          class="text-zinc-400 hover:text-zinc-300 text-sm"
-          @click="showAddRating = false"
-        >
-          {{ $t("cancel") }}
-        </button>
+      <div v-else class="mt-4">
+        <p class="text-sm text-zinc-400">
+          {{ $t("users.admin.groups.noBannedRatings") }}
+        </p>
       </div>
+
       <button
-        v-if="!showAddRating"
         type="button"
-        class="mt-4 text-sm text-blue-400 hover:text-blue-300"
-        @click="showAddRating = true"
+        class="mt-4 rounded-md bg-blue-600 px-3 py-2 text-sm font-semibold text-white hover:bg-blue-500"
+        @click="applySlider"
       >
-        {{ $t("users.admin.groups.addBannedRating") }}
+        {{ $t("users.admin.groups.applyAgeRestriction") }}
       </button>
     </div>
+
+    <!-- Advanced: Manual Overrides -->
+    <div class="mt-8 rounded-lg border border-zinc-800 bg-zinc-900 p-6">
+      <details>
+        <summary class="cursor-pointer text-base font-semibold text-zinc-100">
+          {{ $t("users.admin.groups.advancedOverrides") }}
+        </summary>
+        <div class="mt-4">
+          <p class="text-sm text-zinc-400 mb-4">
+            {{ $t("users.admin.groups.sliderOverrideWarning") }}
+          </p>
+
+          <div
+            v-if="group.bannedAgeRatings.length === 0 && !showAddRating"
+            class="text-sm text-zinc-400"
+          >
+            {{ $t("users.admin.groups.noBannedRatings") }}
+          </div>
+
+          <div class="space-y-2">
+            <div
+              v-for="(br, idx) in group.bannedAgeRatings"
+              :key="br.id"
+              class="flex items-center gap-2"
+            >
+              <!-- eslint-disable-next-line @intlify/vue-i18n/no-raw-text -->
+              <span
+                class="inline-flex items-center rounded-full bg-zinc-800 px-2.5 py-0.5 text-sm font-medium text-zinc-100"
+              >
+                {{ br.organization }}: {{ br.rating }}
+              </span>
+              <button
+                type="button"
+                class="text-red-400 hover:text-red-300 text-sm"
+                @click="removeRating(idx)"
+              >
+                {{ $t("users.admin.groups.removeBannedRating") }}
+              </button>
+            </div>
+          </div>
+
+          <div v-if="showAddRating" class="mt-4 flex items-center gap-2">
+            <select
+              v-model="newRatingOrg"
+              class="rounded-md bg-zinc-800 px-2 py-1 text-sm text-zinc-100 outline outline-1 -outline-offset-1 outline-zinc-700 focus:outline-blue-600"
+            >
+              <option v-for="org in organizations" :key="org" :value="org">
+                {{ org }}
+              </option>
+            </select>
+            <select
+              v-model="newRatingValue"
+              :disabled="!newRatingOrg"
+              class="rounded-md bg-zinc-800 px-2 py-1 text-sm text-zinc-100 outline outline-1 -outline-offset-1 outline-zinc-700 focus:outline-blue-600"
+            >
+              <option
+                v-for="r in availableRatingsForOrg"
+                :key="r"
+                :value="r"
+              >
+                {{ r }}
+              </option>
+            </select>
+            <button
+              type="button"
+              class="rounded-md bg-blue-600 px-2 py-1 text-sm font-semibold text-white hover:bg-blue-500"
+              :disabled="!newRatingOrg || !newRatingValue"
+              @click="addRating"
+            >
+              {{ $t("add") }}
+            </button>
+            <button
+              type="button"
+              class="text-zinc-400 hover:text-zinc-300 text-sm"
+              @click="showAddRating = false"
+            >
+              {{ $t("cancel") }}
+            </button>
+          </div>
+          <button
+            v-if="!showAddRating"
+            type="button"
+            class="mt-4 text-sm text-blue-400 hover:text-blue-300"
+            @click="showAddRating = true"
+          >
+            {{ $t("users.admin.groups.addBannedRating") }}
+          </button>
+        </div>
+      </details>
+    </div>
   </div>
 </template>
 
 <script setup lang="ts">
 import type { AuthMec } from "~/prisma/client/enums";
-import { getAvailableRatings } from "~/utils/ageRatings";
+import {
+  getAvailableRatings,
+  getBannedRatingsForMaxAge,
+  inferMaxAgeFromBannedRatings,
+} from "~/utils/ageRatings";
 import { AgeRatingOrganization } from "~/prisma/client/enums";
 
 useHead({ title: "Edit Group" });
@@ -239,6 +327,20 @@ const newRatingValue = ref("");
 
 const organizations = Object.values(AgeRatingOrganization);
 
+// Slider state
+const sliderAge = ref(18);
+
+const sliderBannedPreview = computed(() =>
+  getBannedRatingsForMaxAge(sliderAge.value),
+);
+
+const hasManualOverrides = computed(() => {
+  if (!group.value) return false;
+  return (
+    inferMaxAgeFromBannedRatings(group.value.bannedAgeRatings) === null
+  );
+});
+
 const availableRatingsForOrg = computed(() => {
   if (!newRatingOrg.value) return [];
   return getAvailableRatings(newRatingOrg.value as AgeRatingOrganization);
@@ -255,6 +357,12 @@ const fetchGroup = async () => {
   );
   editName.value = group.value.name;
   editDescription.value = group.value.description;
+
+  // Initialize slider from existing banned ratings
+  const inferred = inferMaxAgeFromBannedRatings(
+    group.value.bannedAgeRatings,
+  );
+  sliderAge.value = inferred ?? 18;
 };
 
 // Fetch all users for member add dropdown
@@ -323,6 +431,16 @@ const removeMember = async (userId: string) => {
   await fetchGroup();
 };
 
+const applySlider = async () => {
+  if (!group.value) return;
+  const bannedRatings = getBannedRatingsForMaxAge(sliderAge.value);
+  await $dropFetch(`/api/v1/admin/groups/${groupId}/ratings`, {
+    method: "PATCH",
+    body: { bannedRatings },
+  });
+  await fetchGroup();
+};
+
 const addRating = async () => {
   if (!group.value || !newRatingOrg.value || !newRatingValue.value) return;
   const newRatings = [
diff --git a/server/server/internal/metadata/giantbomb.ts b/server/server/internal/metadata/giantbomb.ts
index a629d09a..7b867353 100644
--- a/server/server/internal/metadata/giantbomb.ts
+++ b/server/server/internal/metadata/giantbomb.ts
@@ -114,10 +114,10 @@ const GB_BOARD_TO_ORG: Record<string, AgeRatingOrganization> = {
 };
 
 function lowercaseNormMap(
-  ratings: Record<string, string>,
+  ratings: Record<string, { value: string; age: number }>,
 ): Record<string, string> {
   return Object.fromEntries(
-    Object.values(ratings).map((v) => [v.toLowerCase(), v]),
+    Object.values(ratings).map((r) => [r.value.toLowerCase(), r.value]),
   );
 }
 
@@ -127,14 +127,14 @@ const GB_RATING_NORMALIZE: Record<
 > = {
   [AgeRatingOrganization.ESRB]: {
     ...lowercaseNormMap(ESRBRating),
-    "early childhood": ESRBRating.EC,
-    everyone: ESRBRating.E,
-    "everyone 10+": ESRBRating.E10,
-    teen: ESRBRating.T,
-    mature: ESRBRating.M,
-    "mature 17+": ESRBRating.M,
-    "adults only": ESRBRating.AO,
-    "adults only 18+": ESRBRating.AO,
+    "early childhood": ESRBRating.EC.value,
+    everyone: ESRBRating.E.value,
+    "everyone 10+": ESRBRating.E10.value,
+    teen: ESRBRating.T.value,
+    mature: ESRBRating.M.value,
+    "mature 17+": ESRBRating.M.value,
+    "adults only": ESRBRating.AO.value,
+    "adults only 18+": ESRBRating.AO.value,
   },
   [AgeRatingOrganization.PEGI]: lowercaseNormMap(PEGIRating),
   [AgeRatingOrganization.CERO]: lowercaseNormMap(CEROrating),
@@ -142,9 +142,9 @@ const GB_RATING_NORMALIZE: Record<
   [AgeRatingOrganization.GRAC]: lowercaseNormMap(GRACRating),
   [AgeRatingOrganization.ACB]: {
     ...lowercaseNormMap(ACBRating),
-    "ma 15+": ACBRating.MA15,
-    "r 18+": ACBRating.R18,
-    "refused classification": ACBRating.RC,
+    "ma 15+": ACBRating.MA15.value,
+    "r 18+": ACBRating.R18.value,
+    "refused classification": ACBRating.RC.value,
   },
   [AgeRatingOrganization.ClassInd]: {},
 };
diff --git a/server/server/internal/metadata/igdb.ts b/server/server/internal/metadata/igdb.ts
index 3443fede..306622d5 100644
--- a/server/server/internal/metadata/igdb.ts
+++ b/server/server/internal/metadata/igdb.ts
@@ -109,49 +109,49 @@ const IGDB_CATEGORY_TO_ORG: Record<number, AgeRatingOrganization> = {
 
 const IGDB_RATING_TO_STRING: Record<number, string> = {
   // PEGI
-  1: PEGIRating["3"],
-  2: PEGIRating["7"],
-  3: PEGIRating["12"],
-  4: PEGIRating["16"],
-  5: PEGIRating["18"],
+  1: PEGIRating["3"].value,
+  2: PEGIRating["7"].value,
+  3: PEGIRating["12"].value,
+  4: PEGIRating["16"].value,
+  5: PEGIRating["18"].value,
   // ESRB
-  7: ESRBRating.EC,
-  8: ESRBRating.E,
-  9: ESRBRating.E10,
-  10: ESRBRating.T,
-  11: ESRBRating.M,
-  12: ESRBRating.AO,
+  7: ESRBRating.EC.value,
+  8: ESRBRating.E.value,
+  9: ESRBRating.E10.value,
+  10: ESRBRating.T.value,
+  11: ESRBRating.M.value,
+  12: ESRBRating.AO.value,
   // CERO
-  13: CEROrating.A,
-  14: CEROrating.B,
-  15: CEROrating.C,
-  16: CEROrating.D,
-  17: CEROrating.Z,
+  13: CEROrating.A.value,
+  14: CEROrating.B.value,
+  15: CEROrating.C.value,
+  16: CEROrating.D.value,
+  17: CEROrating.Z.value,
   // USK
-  18: USKRating["0"],
-  19: USKRating["6"],
-  20: USKRating["12"],
-  21: USKRating["16"],
-  22: USKRating["18"],
+  18: USKRating["0"].value,
+  19: USKRating["6"].value,
+  20: USKRating["12"].value,
+  21: USKRating["16"].value,
+  22: USKRating["18"].value,
   // GRAC
-  23: GRACRating.ALL,
-  24: GRACRating["12"],
-  25: GRACRating["15"],
-  26: GRACRating["18"],
+  23: GRACRating.ALL.value,
+  24: GRACRating["12"].value,
+  25: GRACRating["15"].value,
+  26: GRACRating["18"].value,
   // CLASS_IND
-  28: ClassIndRating.L,
-  29: ClassIndRating["10"],
-  30: ClassIndRating["12"],
-  31: ClassIndRating["14"],
-  32: ClassIndRating["16"],
-  33: ClassIndRating["18"],
+  28: ClassIndRating.L.value,
+  29: ClassIndRating["10"].value,
+  30: ClassIndRating["12"].value,
+  31: ClassIndRating["14"].value,
+  32: ClassIndRating["16"].value,
+  33: ClassIndRating["18"].value,
   // ACB
-  34: ACBRating.G,
-  35: ACBRating.PG,
-  36: ACBRating.M,
-  37: ACBRating.MA15,
-  38: ACBRating.R18,
-  39: ACBRating.RC,
+  34: ACBRating.G.value,
+  35: ACBRating.PG.value,
+  36: ACBRating.M.value,
+  37: ACBRating.MA15.value,
+  38: ACBRating.R18.value,
+  39: ACBRating.RC.value,
 };
 
 // https://api-docs.igdb.com/?shell#game
diff --git a/server/server/internal/metadata/steam.ts b/server/server/internal/metadata/steam.ts
index 66f0e0c7..d180f894 100644
--- a/server/server/internal/metadata/steam.ts
+++ b/server/server/internal/metadata/steam.ts
@@ -200,10 +200,10 @@ const STEAM_RATING_KEY_TO_ORG: Record<string, AgeRatingOrganization> = {
 };
 
 function lowercaseNormMap(
-  ratings: Record<string, string>,
+  ratings: Record<string, { value: string; age: number }>,
 ): Record<string, string> {
   return Object.fromEntries(
-    Object.values(ratings).map((v) => [v.toLowerCase(), v]),
+    Object.values(ratings).map((r) => [r.value.toLowerCase(), r.value]),
   );
 }
 
diff --git a/server/utils/ageRatings.ts b/server/utils/ageRatings.ts
index f36156e4..639e609e 100644
--- a/server/utils/ageRatings.ts
+++ b/server/utils/ageRatings.ts
@@ -5,64 +5,71 @@ import { AgeRatingOrganization } from "~/prisma/client/enums";
  * will be to normalize to these ratings. Admins of course can override and set a separate rating if needed.
  *
  * These will change, but historically very infrequently.
+ *
+ * Each rating has a `value` (the string stored in the database) and an `age` (the minimum age for that rating).
  */
 
+interface RatingDef {
+  readonly value: string;
+  readonly age: number;
+}
+
 export const ESRBRating = {
-  EC: "EC",
-  E: "E",
-  E10: "E10",
-  T: "T",
-  M: "M",
-  AO: "AO",
+  EC: { value: "EC", age: 3 },
+  E: { value: "E", age: 6 },
+  E10: { value: "E10", age: 10 },
+  T: { value: "T", age: 13 },
+  M: { value: "M", age: 17 },
+  AO: { value: "AO", age: 18 },
 } as const;
 
 export const PEGIRating = {
-  "3": "3",
-  "7": "7",
-  "12": "12",
-  "16": "16",
-  "18": "18",
+  "3": { value: "3", age: 3 },
+  "7": { value: "7", age: 7 },
+  "12": { value: "12", age: 12 },
+  "16": { value: "16", age: 16 },
+  "18": { value: "18", age: 18 },
 } as const;
 
 export const CEROrating = {
-  A: "A",
-  B: "B",
-  C: "C",
-  D: "D",
-  Z: "Z",
+  A: { value: "A", age: 0 },
+  B: { value: "B", age: 12 },
+  C: { value: "C", age: 15 },
+  D: { value: "D", age: 17 },
+  Z: { value: "Z", age: 18 },
 } as const;
 
 export const USKRating = {
-  "0": "0",
-  "6": "6",
-  "12": "12",
-  "16": "16",
-  "18": "18",
+  "0": { value: "0", age: 0 },
+  "6": { value: "6", age: 6 },
+  "12": { value: "12", age: 12 },
+  "16": { value: "16", age: 16 },
+  "18": { value: "18", age: 18 },
 } as const;
 
 export const GRACRating = {
-  ALL: "ALL",
-  "12": "12",
-  "15": "15",
-  "18": "18",
+  ALL: { value: "ALL", age: 0 },
+  "12": { value: "12", age: 12 },
+  "15": { value: "15", age: 15 },
+  "18": { value: "18", age: 18 },
 } as const;
 
 export const ClassIndRating = {
-  L: "L",
-  "10": "10",
-  "12": "12",
-  "14": "14",
-  "16": "16",
-  "18": "18",
+  L: { value: "L", age: 0 },
+  "10": { value: "10", age: 10 },
+  "12": { value: "12", age: 12 },
+  "14": { value: "14", age: 14 },
+  "16": { value: "16", age: 16 },
+  "18": { value: "18", age: 18 },
 } as const;
 
 export const ACBRating = {
-  G: "G",
-  PG: "PG",
-  M: "M",
-  MA15: "MA15",
-  R18: "R18",
-  RC: "RC",
+  G: { value: "G", age: 0 },
+  PG: { value: "PG", age: 8 },
+  M: { value: "M", age: 15 },
+  MA15: { value: "MA15", age: 15 },
+  R18: { value: "R18", age: 18 },
+  RC: { value: "RC", age: 18 },
 } as const;
 
 export const RATINGS_FOR_ORGANIZATION = {
@@ -73,8 +80,65 @@ export const RATINGS_FOR_ORGANIZATION = {
   [AgeRatingOrganization.GRAC]: GRACRating,
   [AgeRatingOrganization.ClassInd]: ClassIndRating,
   [AgeRatingOrganization.ACB]: ACBRating,
-} as const satisfies Record<AgeRatingOrganization, Record<string, string>>;
+} as const satisfies Record<
+  AgeRatingOrganization,
+  Record<string, RatingDef>
+>;
 
 export function getAvailableRatings(org: AgeRatingOrganization): string[] {
-  return Object.values(RATINGS_FOR_ORGANIZATION[org]);
+  return Object.values(RATINGS_FOR_ORGANIZATION[org]).map((r) => r.value);
+}
+
+/**
+ * Given a maximum allowed age, returns all org:rating pairs that exceed it (should be banned).
+ */
+export function getBannedRatingsForMaxAge(
+  maxAge: number,
+): Array<{ organization: AgeRatingOrganization; rating: string }> {
+  const banned: Array<{ organization: AgeRatingOrganization; rating: string }> =
+    [];
+  for (const org of Object.values(AgeRatingOrganization)) {
+    const ratings = RATINGS_FOR_ORGANIZATION[org];
+    for (const def of Object.values(ratings)) {
+      if (def.age > maxAge) {
+        banned.push({ organization: org, rating: def.value });
+      }
+    }
+  }
+  return banned;
+}
+
+/**
+ * Given a set of banned ratings, infer what max age slider position would produce them.
+ * Returns null if the set doesn't match any clean slider threshold (manual overrides).
+ */
+export function inferMaxAgeFromBannedRatings(
+  banned: Array<{ organization: string; rating: string }>,
+): number | null {
+  if (banned.length === 0) return 18;
+
+  // Try each possible age and check if the banned set matches exactly
+  const possibleAges = new Set<number>();
+  for (const orgRatings of Object.values(RATINGS_FOR_ORGANIZATION)) {
+    for (const def of Object.values(orgRatings)) {
+      possibleAges.add(def.age);
+    }
+  }
+
+  const bannedSet = new Set(banned.map((b) => `${b.organization}:${b.rating}`));
+
+  for (const age of Array.from(possibleAges).sort((a, b) => b - a)) {
+    const expected = getBannedRatingsForMaxAge(age);
+    const expectedSet = new Set(
+      expected.map((e) => `${e.organization}:${e.rating}`),
+    );
+    if (
+      expectedSet.size === bannedSet.size &&
+      [...expectedSet].every((e) => bannedSet.has(e))
+    ) {
+      return age;
+    }
+  }
+
+  return null;
 }