Yeah... I've said it before, I'll say it again. What's fun at five is fun at fifty, legal and physical constraints aside. If a "kid's" show is entertaining, it is entertaining, regardless as to the age or arbitrary maturity status the person watching falls under. Looney Toons (Or apparently Tunes. Eh.) was pretty great when I was a pre-teen. It was pretty great when I was a teen. It's been pretty great when I've watched it in my twenties. It'll be pretty great when I watch it in my thirties, and forties, and fifties, and so on. Interesting enough characters, gags, jokes, scenarios, etc., so forth, so on. It's got a lot of objectively good stuff in its library of episodes*.
Denying oneself the opportunity of enjoyment or enlightenment just because one has crossed an arbitrary and meaningless age or behavioral pattern line is the silliest of things, imo. Not liking it for other reasons is fine, but just because of stuff like "I'm not a kid" is just... don't do that to yourself, people ;_;
*It would be kinda' surprising if there wasn't, considering the shows and shows spun off from them have been going pretty much continuously since the 1930s. Checking good ol' Doc Wiki, just for Looney Tunes itself there's been over a thousand animated shorts made under its banner. Sturgeon's revelation would note that means there's at least a hundred of those that are pretty good.