diff --git a/day 4 class vs instance b/day 4 class vs instance
new file mode 100644
index 0000000..b50c6c9
--- /dev/null
+++ b/day 4 class vs instance	
@@ -0,0 +1,15 @@
+class Person:
+    def __init__(self, initialAge):
+        if initialAge > 0:
+            self.age = initialAge
+        else:
+            print("Age is not valid, setting age to 0.")
+            self.age = 0
+
+    def amIOld(self):
+        if self.age < 13:
+            print("You are young.")
+        elif self.age < 18:
+            print("You are a teenager.")
+        else:
+            print("You are old.")