I'm 15, and KH was a great game to me. Definantly not for kids though, I mean, some of the later battles and the extra ones, one really has to train up for. And you Can brat Sephiroth before lv. 80. I did it al 79 (lol).
As for parent problems... They play more games than I do, and that's seriously saying something. They show me alot of the new games that come out.