diff --git a/app/features/calendar/calendar-utils.ts b/app/features/calendar/calendar-utils.ts
new file mode 100644
index 000000000..b0d0ffb2c
--- /dev/null
+++ b/app/features/calendar/calendar-utils.ts
@@ -0,0 +1,4 @@
+import { userDiscordIdIsAged } from "~/utils/users";
+
+export const canAddNewEvent = (user: { discordId: string }) =>
+  userDiscordIdIsAged(user);
diff --git a/app/features/calendar/routes/calendar.new.tsx b/app/features/calendar/routes/calendar.new.tsx
index e15c49e3d..ac49670cc 100644
--- a/app/features/calendar/routes/calendar.new.tsx
+++ b/app/features/calendar/routes/calendar.new.tsx
@@ -34,7 +34,7 @@ import type {
 import { useIsMounted } from "~/hooks/useIsMounted";
 import { useTranslation } from "~/hooks/useTranslation";
 import { useUser } from "~/features/auth/core";
-import { requireUserId } from "~/features/auth/core/user.server";
+import { requireUser } from "~/features/auth/core/user.server";
 import { i18next } from "~/modules/i18n";
 import { MapPool } from "~/features/map-list-generator/core/map-pool";
 import { canEditCalendarEvent, canEnableTOTools } from "~/permissions";
@@ -71,6 +71,7 @@ import type { RankedModeShort } from "~/modules/in-game-lists";
 import { rankedModesShort } from "~/modules/in-game-lists/modes";
 import * as BadgeRepository from "~/features/badges/BadgeRepository.server";
 import * as CalendarRepository from "~/features/calendar/CalendarRepository.server";
+import { canAddNewEvent } from "../calendar-utils";
 
 const MIN_DATE = new Date(Date.UTC(2015, 4, 28));
 
@@ -136,12 +137,14 @@ const newCalendarEventActionSchema = z.object({
 });
 
 export const action: ActionFunction = async ({ request }) => {
-  const user = await requireUserId(request);
+  const user = await requireUser(request);
   const data = await parseRequestFormData({
     request,
     schema: newCalendarEventActionSchema,
   });
 
+  validate(canAddNewEvent(user), "Not authorized", 401);
+
   const commonArgs = {
     name: data.name,
     description: data.description,
@@ -207,9 +210,11 @@ export const handle: SendouRouteHandle = {
 
 export const loader = async ({ request }: LoaderArgs) => {
   const t = await i18next.getFixedT(request);
-  const user = await requireUserId(request);
+  const user = await requireUser(request);
   const url = new URL(request.url);
 
+  validate(canAddNewEvent(user), "Not authorized", 401);
+
   const eventId = Number(url.searchParams.get("eventId"));
   const eventToEdit = Number.isNaN(eventId)
     ? undefined
diff --git a/app/features/calendar/routes/calendar.tsx b/app/features/calendar/routes/calendar.tsx
index 0ed4cf0b8..19c5ba687 100644
--- a/app/features/calendar/routes/calendar.tsx
+++ b/app/features/calendar/routes/calendar.tsx
@@ -44,6 +44,7 @@ import { Tags } from "../components/Tags";
 import { Divider } from "~/components/Divider";
 import { UsersIcon } from "~/components/icons/Users";
 import * as CalendarRepository from "../CalendarRepository.server";
+import { canAddNewEvent } from "../calendar-utils";
 
 export const links: LinksFunction = () => {
   return [{ rel: "stylesheet", href: styles }];
@@ -176,7 +177,7 @@ export default function CalendarPage() {
       <WeekLinks />
       <EventsToReport />
       <div className="stack md">
-        {user && (
+        {user && canAddNewEvent(user) && (
           <LinkButton to="new" className="calendar__add-new-button" size="tiny">
             {t("addNew")}
           </LinkButton>
diff --git a/app/utils/users.test.ts b/app/utils/users.test.ts
index 728444a44..a4a437b89 100644
--- a/app/utils/users.test.ts
+++ b/app/utils/users.test.ts
@@ -1,8 +1,10 @@
 import { suite } from "uvu";
 import * as assert from "uvu/assert";
-import { queryToUserIdentifier } from "./users";
+import { queryToUserIdentifier, userDiscordIdIsAged } from "./users";
+import MockDate from "mockdate";
 
 const QueryToUserIdentifier = suite("queryToUserIdentifier()");
+const UserDiscordIdIsAged = suite("userDiscordIdIsAged()");
 
 QueryToUserIdentifier("returns null if no match", () => {
   assert.equal(queryToUserIdentifier("foo"), null);
@@ -41,4 +43,32 @@ QueryToUserIdentifier("gets id", () => {
   });
 });
 
+UserDiscordIdIsAged.before.each(() => {
+  MockDate.set(new Date("2023-11-25T00:00:00.000Z"));
+});
+
+UserDiscordIdIsAged.after.each(() => {
+  MockDate.reset();
+});
+
+UserDiscordIdIsAged("returns false if discord id is not aged", () => {
+  assert.equal(
+    userDiscordIdIsAged({ discordId: "1177730652641181871" }),
+    false,
+  );
+});
+
+UserDiscordIdIsAged("returns true if discord id is aged", () => {
+  assert.equal(userDiscordIdIsAged({ discordId: "79237403620945920" }), true);
+});
+
+UserDiscordIdIsAged("throws error if discord id missing", () => {
+  assert.throws(() => userDiscordIdIsAged({ discordId: "" }));
+});
+
+UserDiscordIdIsAged("throws error if discord id too short", () => {
+  assert.throws(() => userDiscordIdIsAged({ discordId: "1234" }));
+});
+
 QueryToUserIdentifier.run();
+UserDiscordIdIsAged.run();
diff --git a/app/utils/users.ts b/app/utils/users.ts
index 098c464ac..66318eb90 100644
--- a/app/utils/users.ts
+++ b/app/utils/users.ts
@@ -38,3 +38,30 @@ export function queryToUserIdentifier(
 
   return null;
 }
+
+// snowflake logic from https://github.dev/vegeta897/snow-stamp/blob/main/src/util.js
+const DISCORD_EPOCH = 1420070400000;
+
+// Converts a snowflake ID string into a JS Date object using the provided epoch (in ms), or Discord's epoch if not provided
+function convertSnowflakeToDate(snowflake: string) {
+  // Convert snowflake to BigInt to extract timestamp bits
+  // https://discord.com/developers/docs/reference#snowflakes
+  const milliseconds = BigInt(snowflake) >> 22n;
+  return new Date(Number(milliseconds) + DISCORD_EPOCH);
+}
+
+const AGED_CRITERIA = 1000 * 60 * 60 * 24 * 30 * 3; // 3 months
+export function userDiscordIdIsAged(user: { discordId: string }) {
+  // types should catch this but since this is a permission related
+  // code playing it safe
+  if (!user.discordId) {
+    throw new Error("No discord id");
+  }
+  if (user.discordId.length < DISCORD_ID_MIN_LENGTH) {
+    throw new Error("Not a valid discord id");
+  }
+
+  const timestamp = convertSnowflakeToDate(user.discordId).getTime();
+
+  return Date.now() - timestamp > AGED_CRITERIA;
+}
diff --git a/tsconfig.json b/tsconfig.json
index 95d166d1b..c1ea698b0 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -8,7 +8,7 @@
     "jsx": "react-jsx",
     "moduleResolution": "node",
     "resolveJsonModule": true,
-    "target": "ES2019",
+    "target": "ES2020",
     "strict": true,
     "baseUrl": ".",
     "paths": {