I used to believe that you could change your date of birth to whenever you wanted it.
A childhood belief about birthdays

others believed things like this
- When I was younger, I wanted to marry Willie Nelson so I wouldn't have to change my name.— stacy
- I used to believe that people had an expirey date.— Mason
- When I was little, I thought that you had to marry someone who was born on the same date as you.— Lauren
- I used to think Billy Idols "Eyes without a face" was "How's about a date" : - )— Shay
- I used to believe that my birth mark was a tea stain!Anon
- When i was little i used to think that a birth mark was the place on the body where you came out of the mother— bipbop