Growing up with 3 older brothers, I thought that people never stopped growing. I thought the older you got, the taller you got. When I found out my grandparents were visiting, I asked how old they were so I could imagine how tall they'd be. I was really surprised when they were both shorter than my Dad.
A childhood belief about getting older

others believed things like this
- 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 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
- I thought my grandad would get older, so I asked him 'What do you want to be when you're older?'.— Afterlife Dreamin'
- I used to think that growing pains meant that a tomato plant was growing in your stomach.— Annette
- I once thought people would keep growing until they were as big as buildings if they didn't go to the doctor. — Tufty