diff --git a/backend/app/schemas/admin.py b/backend/app/schemas/admin.py
index ca0c781..fa52d2a 100644
--- a/backend/app/schemas/admin.py
+++ b/backend/app/schemas/admin.py
@@ -5,7 +5,7 @@ All admin-facing request/response shapes live here to keep the admin router
 clean and testable in isolation.
 """
 import re
-from datetime import datetime
+from datetime import date, datetime
 from typing import Optional, Literal
 
 from pydantic import BaseModel, ConfigDict, Field, field_validator
@@ -42,6 +42,7 @@ class UserListResponse(BaseModel):
 
 class UserDetailResponse(UserListItem):
     preferred_name: Optional[str] = None
+    date_of_birth: Optional[date] = None
     must_change_password: bool = False
     locked_until: Optional[datetime] = None
 
diff --git a/frontend/src/components/admin/UserDetailSection.tsx b/frontend/src/components/admin/UserDetailSection.tsx
index 0f09563..83bdc7a 100644
--- a/frontend/src/components/admin/UserDetailSection.tsx
+++ b/frontend/src/components/admin/UserDetailSection.tsx
@@ -117,6 +117,16 @@ export default function UserDetailSection({ userId, onClose }: UserDetailSection
           <DetailRow label="Last Name" value={user.last_name} />
           <DetailRow label="Email" value={user.email} />
           <DetailRow label="Preferred Name" value={user.preferred_name} />
+          <DetailRow
+            label="Date of Birth"
+            value={user.date_of_birth ? (() => {
+              const dob = new Date(user.date_of_birth + 'T00:00:00');
+              const now = new Date();
+              let age = now.getFullYear() - dob.getFullYear();
+              if (now.getMonth() < dob.getMonth() || (now.getMonth() === dob.getMonth() && now.getDate() < dob.getDate())) age--;
+              return `${dob.toLocaleDateString()} (${age})`;
+            })() : null}
+          />
           <DetailRow
             label="Created"
             value={getRelativeTime(user.created_at)}
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index 378962d..20e209f 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -237,6 +237,7 @@ export interface AdminUser {
 export interface AdminUserDetail extends AdminUser {
   active_sessions: number;
   preferred_name?: string | null;
+  date_of_birth?: string | null;
   must_change_password?: boolean;
   locked_until?: string | null;
 }