diff --git a/.gemini/GEMINI_LAST_MESSAGE.txt b/.gemini/GEMINI_LAST_MESSAGE.txt
new file mode 100644
index 0000000..b08b94e
--- /dev/null
+++ b/.gemini/GEMINI_LAST_MESSAGE.txt
@@ -0,0 +1,14 @@
+Plan:
+1.  **Fix Syntax Error:** I identified that the JavaScript code for age calculation in `includes/layout/footer.php` contained Python-style comments (`#`), causing a syntax error.
+2.  **Correct Comments:** I created and executed a Python script (`fix_footer_js.py` and `fix_footer_js_v2.py`) to replace these with valid JavaScript comments (`//`).
+3.  **Verify:** I verified the file content to ensure the syntax is now correct.
+
+Changed:
+*   `includes/layout/footer.php`: Replaced invalid `#` comments with `//` in the JavaScript section at the end of the file.
+
+Notes:
+*   The automatic age-to-DOB calculation (and vice-versa) should now work correctly when you type in the "Age" field.
+*   The script listens for input on the Age field and sets the DOB to `YYYY-01-01`.
+
+Next: Please try entering the age again in the "Add Patient" or "Edit Patient" modal. It should now automatically populate the Date of Birth field.
+Reminder: Click Save in the editor to sync changes.
\ No newline at end of file
diff --git a/includes/layout/footer.php b/includes/layout/footer.php
index 32d222f..e8bfc8f 100644
--- a/includes/layout/footer.php
+++ b/includes/layout/footer.php
@@ -35,13 +35,17 @@
                         </div>
                     </div>
                     <div class="row">
-                        <div class="col-md-4 mb-3">
+                        <div class="col-md-3 mb-3">
                             <label class="form-label"><?php echo __('phone'); ?></label>
                             <input type="text" name="phone" class="form-control" required>
                         </div>
-                        <div class="col-md-4 mb-3">
+                        <div class="col-md-3 mb-3">
                             <label class="form-label"><?php echo __('dob'); ?></label>
-                            <input type="text" name="dob" class="form-control masked-date" placeholder="YYYY-MM-DD">
+                            <input type="text" name="dob" id="add_patient_dob" class="form-control masked-date" placeholder="YYYY-MM-DD">
+                        </div>
+                        <div class="col-md-2 mb-3">
+                            <label class="form-label"><?php echo __('age'); ?></label>
+                            <input type="number" id="add_patient_age" class="form-control" placeholder="<?php echo __('age'); ?>" min="0" max="150">
                         </div>
                         <div class="col-md-4 mb-3">
                             <label class="form-label"><?php echo __('gender'); ?></label>
@@ -129,14 +133,18 @@
                         </div>
                     </div>
                     <div class="row">
-                        <div class="col-md-4 mb-3">
+                        <div class="col-md-3 mb-3">
                             <label class="form-label"><?php echo __('phone'); ?></label>
                             <input type="text" name="phone" id="edit_patient_phone" class="form-control" required>
                         </div>
-                        <div class="col-md-4 mb-3">
+                        <div class="col-md-3 mb-3">
                             <label class="form-label"><?php echo __('dob'); ?></label>
                             <input type="text" name="dob" id="edit_patient_dob" class="form-control masked-date" placeholder="YYYY-MM-DD">
                         </div>
+                        <div class="col-md-2 mb-3">
+                            <label class="form-label"><?php echo __('age'); ?></label>
+                            <input type="number" id="edit_patient_age" class="form-control" placeholder="<?php echo __('age'); ?>" min="0" max="150">
+                        </div>
                         <div class="col-md-4 mb-3">
                             <label class="form-label"><?php echo __('gender'); ?></label>
                             <select name="gender" id="edit_patient_gender" class="form-select">
@@ -3232,6 +3240,47 @@ $drug_groups_js = $db->query("SELECT * FROM drugs_groups ORDER BY name_$lang")->
         modal.show();
     }
 
+
+    // Age to DOB Calculation
+    function setupAgeCalculation(ageId, dobId) {
+        var ageInput = document.getElementById(ageId);
+        var dobInput = document.getElementById(dobId);
+        
+        if (ageInput && dobInput) {
+            ageInput.addEventListener('input', function() {
+                var age = parseInt(this.value);
+                if (!isNaN(age) && age >= 0) {
+                    var currentYear = new Date().getFullYear();
+                    var birthYear = currentYear - age;
+                    // Default to Jan 1st
+                    var dob = birthYear + '-01-01';
+                    dobInput.value = dob;
+                    // Trigger events for masking/validation
+                    dobInput.dispatchEvent(new Event('input', { bubbles: true }));
+                    dobInput.dispatchEvent(new Event('change', { bubbles: true }));
+                }
+            });
+            
+            dobInput.addEventListener('change', function() {
+                 // Try to calculate age from DOB if age is empty
+                 if (this.value && this.value.length === 10 && !ageInput.value) {
+                     var dob = new Date(this.value);
+                     var today = new Date();
+                     var age = today.getFullYear() - dob.getFullYear();
+                     var m = today.getMonth() - dob.getMonth();
+                     if (m < 0 || (m === 0 && today.getDate() < dob.getDate())) {
+                         age--;
+                     }
+                     if (!isNaN(age) && age >= 0) {
+                         ageInput.value = age;
+                     }
+                 }
+            });
+        }
+    }
+
+    setupAgeCalculation('add_patient_age', 'add_patient_dob');
+    setupAgeCalculation('edit_patient_age', 'edit_patient_dob');
 </script>
 </body>