This isn't really my believe, but anyway: I grew up with my cousin, who was a year younger than me. One day, he was angry at me, (for a reason I can't remember, I think maybe because I was bigger,) and we started argueing. "Someday I'll be older than you!!" He screamed. "Uh-uh! Every year you grow older, so will I! I'll always be older!" At this he shouted at the top of his lungs and began to cry. Frankly, I'm still older than him.
A childhood belief about birthdays

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 thought I got one year older when my family sang the birthday song.— I am the ghost
- when i was really young, i couldn't figure out why i can't get older than my older sister.— angela
- I thought that Dad's were always older then Mom's, come to find out my mom is a few months older than my dad.— Nicole
- 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 believe that everybody who was bigger or taller than I was always older than me.— Stano Finji