You remind me of these girls in school asking at the age of 13: "What, you are still reading comics? That's for children, I'm too grown up for that." That really hurt me, 'should there be a time when I'm too old to like Asterix?' - Gladly I'm grown up now and know that it's not true.
Ha ha, I remember those kind of girls - didn't mean it like that. Asterix is great, original, and doesn't take itself too serious - unlike the modern SW movies. I can still enjoy some fantasy/Sci Fi games for example, or a good Arthur C. Clarke or Frank Herbert novel or short story. It's more about growing tired of the lack of originality (genre conventions aside), and the tendency to oversimplified, black and white storytelling and characters prevalent in the genres than an age question, I guess - though of course these things can be connected. I've always preferred non-fiction, but admittedly more so with age. I could probably still enjoy some of the better Star Wars expanded universe litterature, like the Thrawn Trilogy or perhaps some of the Legacy books (but can wonder how much of that is nostalgia), and I know I can still enjoy fantasy like the Silmarillion. I'd rather have some steam punk or post apocalyptic universe though, a modern take on the genre like A Song of Ice and Fire, if it must be fantastical, but rather fiction 'classics' (there's a lot of excellent 19th century litterature) or post-modern, but I'd still be more inclined to read history or philosophy.