I'm 31 and my girlfriend just turned 32... we don't own a boat (yet) but we do charter quite a bit. The first time we went out was in July of 2005... we took a friend of mine from college (26 at the time) and his wife. They fell in love with it and have been back every time we charter. We also took another couple a few times who are the same age as us. I agree that there aren't too many young people sailing these days. We were always the youngest boat in the marina.
Anyway, if anyone wants some youthful company on their sailboat in the northern Chesapeake Bay, I'd be more than happy to oblige.