I've told people for years that I'm 12 - when my 23 year old grandson was 4 he said, "grandma, you can't be 12 - if you were 12 momma wouldn't even be born yet"... pretty good thinking for a four-year-old....
Celebrated my 51st 12th birthday in April... all the grandkids got a big kick out of their 13th birthdays because they were older than me..