I'm going to ask friends to stop making certain jokes
Is there a reason you want them to stop making these jokes?
I don't watch the same animations anymore and I found those jokes insulting to me.  I'd have to be a kid again in order to laugh along
I can understand not finding a joke funny any more, but it sounds like your friends still like them. You can tell them that it's no longer funny to you, but don't expect them to stop telling the jokes.
It's just jokes I don't know why you take this in a serious manner.
If you just demand they stop, it could hurt their feelings. I still think that you should let your friends tell whatever jokes they like among themselves. If you find the jokes unfunny or insulting to your intelligence, tell them politely. Or you could change the subject to something you all enjoy.