When you grow up you become the opposite sex. When I was a little girl I would often talk about what I was going to do when I was older and I would start out the sentence with, "When I grow up and become a man..."
A childhood belief about getting older

others believed things like this
- i thought that when it was your birthday you grow and then you didn't grow until a years time.— hello
- When I was little, I couldn't wait to grow up so I could grow a mustache. I am female.— Laura
- when you eat the seeds from a watermelon a watermelon will start to grow inside your stomache.Anon
- My older brother used to tell me if you ate raw potatoes your teeth would grow long and curly!— Lauren
- When I was a little girl, I used to believe that if you planted a banknote, a banknote tree would grow.— Domi Contreras
- I used to believe that if I could kiss my elbow that I would turn into a girl (the opposite sex).— Rusty