Until I was about 8 (a long time to hold this belief), I thought that men were supposed to marry women who were both younger and shorter than them. I didn't think it was a law or anything, just the socially acceptable thing to do. So I thought very poorly of my uncle who married a woman a couple years older and much taller and thought they must be social outcasts.
A childhood belief about marriage

others believed things like this
- I used to believe that the man had to be taller the the woman to married her.Anon
- I used to think Uncle Ben and Aunt Jemima were a married couple. — l stu electtirc boogaloo
- Until I was around 9 or 10 I believed that a woman was only allowed to marry a man who was older than her. — Rose
- I thought that socialism just meant being social and didn't get why anyone would be against it!— Olcasgean
- I used to think I was going to marry my mom, even though my dad was already married to her.— nick
- I used to believe that if you were taller than someone, you had to be older than them.Anon