When I was young I was SO convinced that I should be older than my sister because my birthday was in August and hers was in September. To a young girls mind, since my birthday came before hers I obviously was older. (regardless of the fact that she was 3 years older than me.)
A childhood belief about birthdays

others believed things like this
- when i was really young, i couldn't figure out why i can't get older than my older sister.— angela
- i used to think that i was older than my dad because my birthday was before his— zara
- My cousic used to think he was older than me because his birthday was in June and mine was in December.— //**...Ethan...**\\
- i thought I got one year older when my family sang the birthday song.— I am the ghost
- a friend of my little sister's had 4 older brothers, so she thought that when you got older you grew a penis!Anon
- My older sister had me convinced that noodles grew on trees, but that rice was man-made...— Trusting little brother