My friend's five year old son can not understand the concept that his mother and I were friends before he was born. Whenever I kept him he thought I was a teenager like his other babysitters. One day he was being particulary rude and I explained to him that I was an adult just like his mother, and in fact am older than she is. He thought about this for a minute and replied, "Yeh but my mom is taller than you."
A childhood belief about getting older

others believed things like this
- My wife thought she was Elvis mother when she was 4. It was 1977 the same year he died. — sister vanilla
- I used to believe that if you were taller than someone, you had to be older than them.Anon
- I used to believe that everybody who was bigger or taller than I was always older than me.— Stano Finji
- When I was young, I believed that because my mother was born in New Mexico, that I was part Mexican.Anon
- a friend of my little sister's had 4 older brothers, so she thought that when you got older you grew a penis!Anon
- I used to believe that I was older than my brother because I was born in June and he was born in OctoberAnon