I would guess that maybe he omitted the '1' which would make him 18, but who knows. It's been covered, but I have to chime in as it's completely asinine to grow in your parents' house, especially when you know that they disapprove.

On a sidenote, it's a shame that there is a sheriff out there that overlooks your transgression. Do you think it is only because you are his child? or does he let law-breakers slide all over the place?