I used to think that i was older than my sister because my birthday came first(my birthday is on March 14 and my sister's is on September 17)
A childhood belief about birthdays

others believed things like this
- Until I was well along in years I always thought our family was Irish because my dads birthday was March 17th— Gladys
- i used to think that if i didn't celebrate my birthday each year my younger sister would catch up with me— q
- My sister uesd to think that you did a whole year's worth of growing in the night before your birthday.— Richard Davies
- Up until I was almost 11, I thought that a birthday suit was a special outfit you wore only on your birthdayAnon
- I used to think that a birthday suit was a special outfit you wear on your birthday— Bri
- I used to believe that on your birthday, you didn't advance to your next age until you ate your birthday cake.— Casi