Shit, I'm 19 and my dad will still whoop my ass lol.
That being said, I remember when the rules were:
"don't come home till its dark"
"Don't act up at your friends house, their parents have my permission to whoop your ass"
when being grounded meant in your room, with a book if you were lucky and having to ask to use the restroom
grounding was generally a 1 week minimum, all the way up to the next report card if necessary
standing in the corner for misbehaving until you couldnt stand anymore
not finishing dinner meant no dessert for a week
no tv until homework and chores were done
the sega was yours until dad got home, then he better not know you were on it and you better not look at it
sometimes PB&J was all there was, so your ass better not complain or you're not eating
dont whine at the store because "im not afraid to bust your ass here"
and "don't make me tell your father" was enough to get your ass in line
and im sure theres more.. and again im 19