diff --git a/locales/en/auth.json b/locales/en/auth.json
index ea5633df..88c2c003 100644
--- a/locales/en/auth.json
+++ b/locales/en/auth.json
@@ -8,7 +8,7 @@
     "INVITE_ONLY": "You must be invited to register",
     "EMAIL_INVALID": "Invalid Email",
     "EMAIL_ALREADY_REGISTERED": "Email is already registered",
-    "DATE_OF_BIRTH_UNDERAGE": "You need to be {{years}} or older",
+    "DATE_OF_BIRTH_UNDERAGE": "You need to be {{years}} years or older",
     "CONSENT_REQUIRED": "You must agree to Terms of Service and Privacy Policy.",
     "USERNAME_TOO_MANY_USERS": "Too many users have this username, please try another"
   }
diff --git a/src/routes/api/v8/auth/register.ts b/src/routes/api/v8/auth/register.ts
index e02d8152..410c7f50 100644
--- a/src/routes/api/v8/auth/register.ts
+++ b/src/routes/api/v8/auth/register.ts
@@ -20,7 +20,7 @@ router.post(
 		$email: Email,
 		$fingerprint: String,
 		$invite: String,
-		$date_of_birth: String, // "2000-04-03"
+		$date_of_birth: Date, // "2000-04-03"
 		$gift_code_sku_id: String,
 		$captcha_key: String,
 	}),
@@ -110,7 +110,7 @@ router.post(
 				throw FieldErrors({
 					date_of_birth: {
 						code: "DATE_OF_BIRTH_UNDERAGE",
-						message: req.t("auth:register.DATE_OF_BIRTH_UNDERAGE"),
+						message: req.t("auth:register.DATE_OF_BIRTH_UNDERAGE", { years: register.dateOfBirth.minimum }),
 					},
 				});
 			}