It is definitely meant for all ages. Nintendo could make the game a lot more graphic then it has to be. But anything is a kids game I suppose, just look at pokemon, it's kind of like dog fighting lol.
I think it is a game for everyone but in the cases of mm and tp, it can be disturbing. In my opinion, they should make more zeldas with creepy themes like these ones.
I don't really consider it to be a kids game either.
I don't even think a kid could really understand everything that is going on, until they replay it years later.
I've never really thought they were kiddie games. Some of the bosses would've freaked me out as a kid and some of the dungeons were way too hard when my nephews tried them