diff --git a/demo/03/src/main/java/pl/amu/edu/demo/data/Person.java b/demo/03/src/main/java/pl/amu/edu/demo/data/Person.java
index 36a12de..64580b6 100644
--- a/demo/03/src/main/java/pl/amu/edu/demo/data/Person.java
+++ b/demo/03/src/main/java/pl/amu/edu/demo/data/Person.java
@@ -26,4 +26,16 @@ public class Person {
                 LocalDate.now().minusYears(18).isAfter(birthDate);
     }
 
+    public int getAge() {
+        var birthYear = Objects.requireNonNull(birthDate).getYear();
+        var now = LocalDate.now();
+        var baseDifference = now.getYear() - birthYear;
+        if (birthDate.getMonthValue() > now.getMonthValue() ||
+                (birthDate.getMonthValue() == now.getMonthValue() &&
+                        birthDate.getDayOfMonth() >= now.getDayOfMonth())) {
+            return baseDifference;
+        }
+        return baseDifference - 1;
+    }
+
 }