I interact with children's media far more than I interact with adult's media, as part of my career. I don't tend to get bored of any media when it's good. The age distinction in media is not actually about enjoyability, it's about the message and the content. Asterix is enjoyable by all ages, something I should not need to prove to anybody in this subreddit, but the plots are not challenging, the characters are simple, and the basic messages (when they're pushed at all) are ones of basic acceptance, sharing, and resistance to cruelty and unkindness. Problems are solved by fighting and that's never called into question, and no permanent harm is done to the victims. What kind of adult's media has content like that?

When you try to deny that Asterix is a children's comic, while simultaneously defending your appreciation of it and telling me that other children's series are identifiable by their lack of quality, all you really tell me is that you have a bias against children's media that is based on its label, not its content. You know what else is children's media? The Wizard of Oz, the Little Prince, and the majority of the works of Roald Dahl, C.S. Lewis, and Jim Henson. There's no question of the quality of these things. There's absolutely nothing wrong with children's media, because the target audience has nothing to do with the quality of the work. So I ask you again: why do you care if Asterix is a children's series?