Yeah, I can say the same about younger kids being surprisingly into it. Perhaps it's because they have less money, or they're just genuinely interested.
My kids have my library of stuff to play, so it's hard for me to really tell with them. They play random shit all the time.
My boss' 13 year old son is into Genesis, PS2, Xbox, and PS3. That's what he's got and he doesn't get a ton of money coming his way, so he gets a good bit of value for $50 versus buying one game and being done with it in a couple of days.