Age and some adults, LOL!
When I got my first paper route, my mother insisted that I save half of the pay that she didn't take.
We're in the bank and filling out the forms. The bank gentleman looks over the forms and says to my mother, "You didn't put down your year of birth." My mother says, "I don't want him to know how old I am." I said to the bank gentleman, "Just put in 1913."
On the way home my mother demanded how I knew. I said, "You fill out forms and leave them laying around. Anyone can read the forms from 6 feet away."