diff --git a/routes/register.js b/routes/register.js
index 16d53a6..0649c3c 100644
--- a/routes/register.js
+++ b/routes/register.js
@@ -71,11 +71,12 @@ router.post("/create", async (req, res) => {
   /* =========================
        Pflicht-Zustimmungen
        ========================= */
-  if (!u.agreeConsent || !u.agreeAgb || !u.agreeSepa) {
+
+  if (!u.agreeAgb || !u.agreeSepa || (age < 18 && !u.agreeConsent)) {
     return res.render("register", {
       vertragsarten,
       selectedVertrag: u.vertragsvariante,
-      error: "Bitte bestätige alle rechtlichen Hinweise, um fortzufahren.",
+      error: "Bitte bestätige alle erforderlichen Hinweise.",
       formData: u,
     });
   }
diff --git a/views/register.ejs b/views/register.ejs
index eaa8e31..6a63f82 100644
--- a/views/register.ejs
+++ b/views/register.ejs
@@ -26,6 +26,7 @@
     <div class="col-md-6">
         <input type="date"
            name="geburtsdatum"
+           id="geburtsdatum"
            class="form-control"
            required>
     </div>
@@ -138,7 +139,7 @@
     <hr class="my-4">
     <h5>Rechtliches</h5>
 
-    <div class="form-check mb-2">
+    <div class="form-check mb-2" id="consentBlock" style="display:none;">
         <input class="form-check-input"
                type="checkbox"
                id="agreeConsent"
@@ -176,4 +177,37 @@
 
 </form>
 
+<script>
+document.addEventListener("DOMContentLoaded", function() {
+    const birthInput = document.getElementById("geburtsdatum");
+    const consentBlock = document.getElementById("consentBlock");
+    const consentCheckbox = document.getElementById("agreeConsent");
+
+    function checkAge() {
+        if (!birthInput.value) return;
+
+        const birthDate = new Date(birthInput.value);
+        const today = new Date();
+
+        let age = today.getFullYear() - birthDate.getFullYear();
+        const monthDiff = today.getMonth() - birthDate.getMonth();
+
+        if (monthDiff < 0 || (monthDiff === 0 && today.getDate() < birthDate.getDate())) {
+            age--;
+        }
+
+        if (age < 18) {
+            consentBlock.style.display = "block";
+            consentCheckbox.required = true;
+        } else {
+            consentBlock.style.display = "none";
+            consentCheckbox.required = false;
+            consentCheckbox.checked = false;
+        }
+    }
+
+    birthInput.addEventListener("change", checkAge);
+});
+</script>
+
 <%- include('partials/footer') %>