I like quite a few current cartoons like Regular Show, Adventure Time, etc ¯\_(ツ)_/¯. I mean I guess they have quite a few adult elements that go over kids heads too but I just think they are funny and Adventure Time is really fucking weird.
I think it's pretty stupid to be like you are xx years old you shouldn't be into/like ______ anymore in most cases. The My Little Pony with Bronies thing is more that it's a show that's specifically aimed at little girls that a group of grown men just don't only seem enjoy (whatever there) but actually self identify themselves as a group because of how into it they are. That's a little weird to me but like I said to each their own I guess.