You are really caught up on ages. What's up? There's nothing wrong with cartoons at any age. Especially since there is a lot of anime with adult themes.
I hate the word cartoons .. plz call it anime !! but what if the animes are like ouran host club .. magi .. naruto ... Sword art online !?
I thought so too in the beginning. I thought my friends hated it, but actually they're cool with it.
They want to catch up with Naruto now, so they can talk to me about it. ^^
OT: No, a lot of Animes are even designed for people 18+. ( I don't mean hentai )