diff --git a/src/app/bottles/[id]/page.tsx b/src/app/bottles/[id]/page.tsx
index 235c94e..19956cd 100644
--- a/src/app/bottles/[id]/page.tsx
+++ b/src/app/bottles/[id]/page.tsx
@@ -8,6 +8,7 @@ import TastingNoteForm from '@/components/TastingNoteForm';
 import StatusSwitcher from '@/components/StatusSwitcher';
 import TastingList from '@/components/TastingList';
 import DeleteBottleButton from '@/components/DeleteBottleButton';
+import { validateSession } from '@/services/validate-session';
 
 export default async function BottlePage({
     params,
@@ -16,7 +17,15 @@ export default async function BottlePage({
     params: { id: string },
     searchParams: { session_id?: string }
 }) {
-    const sessionId = searchParams.session_id;
+    let sessionId = searchParams.session_id;
+
+    // Validate Session Age (12 hour limit)
+    if (sessionId) {
+        const isValid = await validateSession(sessionId);
+        if (!isValid) {
+            sessionId = undefined;
+        }
+    }
     const supabase = createServerComponentClient({ cookies });
 
     const { data: bottle } = await supabase
diff --git a/src/components/BottleGrid.tsx b/src/components/BottleGrid.tsx
index 41f9272..d801693 100644
--- a/src/components/BottleGrid.tsx
+++ b/src/components/BottleGrid.tsx
@@ -5,6 +5,7 @@ import Link from 'next/link';
 import { Search, Filter, X, Calendar, Clock, Package, Lock, Unlock, Ghost, FlaskConical, AlertCircle, Trash2, AlertTriangle, PlusCircle } from 'lucide-react';
 import { getStorageUrl } from '@/lib/supabase';
 import { useSearchParams } from 'next/navigation';
+import { validateSession } from '@/services/validate-session';
 
 interface Bottle {
     id: string;
@@ -115,6 +116,19 @@ interface BottleGridProps {
 export default function BottleGrid({ bottles }: BottleGridProps) {
     const searchParams = useSearchParams();
     const sessionId = searchParams.get('session_id');
+    const [validatedSessionId, setValidatedSessionId] = useState<string | null>(null);
+
+    React.useEffect(() => {
+        const checkSession = async () => {
+            if (sessionId) {
+                const isValid = await validateSession(sessionId);
+                setValidatedSessionId(isValid ? sessionId : null);
+            } else {
+                setValidatedSessionId(null);
+            }
+        };
+        checkSession();
+    }, [sessionId]);
 
     const [searchQuery, setSearchQuery] = useState('');
     const [selectedCategory, setSelectedCategory] = useState<string | null>(null);
@@ -284,7 +298,7 @@ export default function BottleGrid({ bottles }: BottleGridProps) {
             {filteredBottles.length > 0 ? (
                 <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-6 w-full max-w-6xl mx-auto px-4">
                     {filteredBottles.map((bottle) => (
-                        <BottleCard key={bottle.id} bottle={bottle} sessionId={sessionId} />
+                        <BottleCard key={bottle.id} bottle={bottle} sessionId={validatedSessionId} />
                     ))}
                 </div>
             ) : (
diff --git a/src/components/CameraCapture.tsx b/src/components/CameraCapture.tsx
index 5254fe8..164ce87 100644
--- a/src/components/CameraCapture.tsx
+++ b/src/components/CameraCapture.tsx
@@ -10,6 +10,7 @@ import { BottleMetadata } from '@/types/whisky';
 import { savePendingBottle } from '@/lib/offline-db';
 import { v4 as uuidv4 } from 'uuid';
 import { findMatchingBottle } from '@/services/find-matching-bottle';
+import { validateSession } from '@/services/validate-session';
 import Link from 'next/link';
 
 interface CameraCaptureProps {
@@ -23,6 +24,19 @@ export default function CameraCapture({ onImageCaptured, onAnalysisComplete, onS
     const router = useRouter();
     const searchParams = useSearchParams();
     const sessionId = searchParams.get('session_id');
+    const [validatedSessionId, setValidatedSessionId] = React.useState<string | null>(null);
+
+    React.useEffect(() => {
+        const checkSession = async () => {
+            if (sessionId) {
+                const isValid = await validateSession(sessionId);
+                setValidatedSessionId(isValid ? sessionId : null);
+            } else {
+                setValidatedSessionId(null);
+            }
+        };
+        checkSession();
+    }, [sessionId]);
 
     const fileInputRef = useRef<HTMLInputElement>(null);
     const [isProcessing, setIsProcessing] = useState(false);
@@ -222,7 +236,7 @@ export default function CameraCapture({ onImageCaptured, onAnalysisComplete, onS
 
                     <button
                         onClick={() => {
-                            const url = `/bottles/${lastSavedId}${sessionId ? `?session_id=${sessionId}` : ''}`;
+                            const url = `/bottles/${lastSavedId}${validatedSessionId ? `?session_id=${validatedSessionId}` : ''}`;
                             router.push(url);
                         }}
                         className="w-full py-4 px-6 bg-zinc-900 dark:bg-zinc-100 text-white dark:text-zinc-900 rounded-2xl font-black uppercase tracking-widest flex items-center justify-center gap-2 hover:bg-zinc-800 dark:hover:bg-white transition-all shadow-xl"
@@ -244,7 +258,7 @@ export default function CameraCapture({ onImageCaptured, onAnalysisComplete, onS
                 </div>
             ) : matchingBottle ? (
                 <Link
-                    href={`/bottles/${matchingBottle.id}${sessionId ? `?session_id=${sessionId}` : ''}`}
+                    href={`/bottles/${matchingBottle.id}${validatedSessionId ? `?session_id=${validatedSessionId}` : ''}`}
                     className="w-full py-4 px-6 bg-amber-600 hover:bg-amber-700 text-white rounded-xl font-semibold flex items-center justify-center gap-2 transition-all active:scale-[0.98] shadow-lg shadow-amber-600/20"
                 >
                     <ExternalLink size={20} />
diff --git a/src/services/save-tasting.ts b/src/services/save-tasting.ts
index e262a0c..fadc11b 100644
--- a/src/services/save-tasting.ts
+++ b/src/services/save-tasting.ts
@@ -3,6 +3,7 @@
 import { createServerActionClient } from '@supabase/auth-helpers-nextjs';
 import { cookies } from 'next/headers';
 import { revalidatePath } from 'next/cache';
+import { validateSession } from './validate-session';
 
 export async function saveTasting(data: {
     bottle_id: string;
@@ -20,6 +21,14 @@ export async function saveTasting(data: {
         const { data: { session } } = await supabase.auth.getSession();
         if (!session) throw new Error('Nicht autorisiert');
 
+        // Validate Session Age (12 hour limit)
+        if (data.session_id) {
+            const isValid = await validateSession(data.session_id);
+            if (!isValid) {
+                throw new Error('Dieses Tasting Session ist bereits abgelaufen (Limit: 12 Stunden).');
+            }
+        }
+
         const { data: tasting, error } = await supabase
             .from('tastings')
             .insert({
diff --git a/src/services/validate-session.ts b/src/services/validate-session.ts
new file mode 100644
index 0000000..c8af5ad
--- /dev/null
+++ b/src/services/validate-session.ts
@@ -0,0 +1,33 @@
+'use server';
+
+import { createServerActionClient } from '@supabase/auth-helpers-nextjs';
+import { cookies } from 'next/headers';
+
+/**
+ * Validates if a session is still "active" based on its age.
+ * Returns true if the session is less than 12 hours old.
+ */
+export async function validateSession(sessionId: string | null): Promise<boolean> {
+    if (!sessionId) return false;
+
+    const supabase = createServerActionClient({ cookies });
+
+    try {
+        const { data: session, error } = await supabase
+            .from('tasting_sessions')
+            .select('created_at')
+            .eq('id', sessionId)
+            .single();
+
+        if (error || !session) return false;
+
+        const createdAt = new Date(session.created_at).getTime();
+        const now = new Date().getTime();
+        const twelveHoursInMs = 12 * 60 * 60 * 1000;
+
+        return (now - createdAt) < twelveHoursInMs;
+    } catch (err) {
+        console.error('Session validation error:', err);
+        return false;
+    }
+}