When I was a kid, I was convinced that everyone in the world lived to be 100 years old. I even rationalized that when people were angry with me, it was "because they were upset that they only had 64 years left to live, and they were jealous that I had 95." Hmmm, must have been a parent? :)
A childhood belief about getting older

others believed things like this
- when i was 5 i used to think that people only live for 10 years and i thought that my parents were 7.Anon
- Until a few years ago, I believed this was a "doggy dog" world, rather than a "dog-eat-dog" world.— jemima
- My Mother used to tell me only the good die young and I would live to be 100+ years old because I was bad.— William
- I used to believe that we lived inside of the world. I asked my Dad who lived on the outside of the world. — Pauline
- I used to believe that it rained when God was upset and that all the birds lived together in one big house.— Rozy
- When I was 6 or 7 years old, I absolutely believed that if a thermometer broke--the world would end. — Suzi