I used to think that, on your birthday, you didn't actually turn a year older until you ate some birthday cake.
A childhood belief about birthdays

others believed things like this
- I used to believe that on your birthday, you didn't advance to your next age until you ate your birthday cake.— Casi
- My parents have the same birthday -- month, day, and year. I though all mom's and dad's had the same birthday.— Cait
- I used to believe that all dessert was birthday cake.— David
- i thought I got one year older when my family sang the birthday song.— I am the ghost
- i used to think that if i didn't celebrate my birthday each year my younger sister would catch up with me— q
- Up until I was almost 11, I thought that a birthday suit was a special outfit you wore only on your birthdayAnon