diff --git a/lib/default.nix b/lib/default.nix
index 4d0035945aaa..aff1df150f13 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -73,7 +73,7 @@ let
     inherit (self.trivial) id const pipe concat or and xor bitAnd bitOr bitXor
       bitNot boolToString mergeAttrs flip mapNullable inNixShell isFloat min max
       importJSON importTOML warn warnIf warnIfNot throwIf throwIfNot checkListOfEnum
-      info showWarnings nixpkgsVersion version isInOldestRelease
+      info showWarnings nixpkgsVersion version isInOldestRelease oldestSupportedReleaseIsAtLeast
       mod compare splitByAndCompare seq deepSeq lessThan add sub
       functionArgs setFunctionArgs isFunction toFunction mirrorFunctionArgs
       fromHexString toHexString toBaseDigits inPureEvalMode isBool isInt pathExists
diff --git a/lib/trivial.nix b/lib/trivial.nix
index f0afbf609fca..205224126094 100644
--- a/lib/trivial.nix
+++ b/lib/trivial.nix
@@ -397,6 +397,15 @@ in {
     Set it to the upcoming release, matching the nixpkgs/.version file.
   */
   isInOldestRelease =
+    lib.warnIf (lib.oldestSupportedReleaseIsAtLeast 2411)
+      "lib.isInOldestRelease is deprecated. Use lib.oldestSupportedReleaseIsAtLeast instead."
+    lib.oldestSupportedReleaseIsAtLeast;
+
+  /**
+    Alias for `isInOldestRelease` introduced in 24.11.
+    Use `isInOldestRelease` in expressions outside of Nixpkgs for greater compatibility.
+   */
+  oldestSupportedReleaseIsAtLeast =
     release:
       release <= lib.trivial.oldestSupportedRelease;