I only think it's inappropriate if all you want to do all day is play games, watch cartoons/anime, read comics. If you can make a living doing these things, that's great and I actually envy you. I'm 27 and I know some people around my age who ***** about not being able to do sit on their asses all day like they used to almost on a daily basis. It's annoying, grow up, you're almost 30, act like it. You can like "childish" things all you want, but you don't get to act like a child because you can't watch TV all day anymore. I still like to play videogames, I still like to watch animated movies, I still enjoy reading some comics (as long as they don't have superheroes in them. Superheroes are fucking stupid), but I have different interests and priorities now.
Here's an interesting example: For the most part, I still wear the same shoes I used to wear when I was a kid. Chuck Taylors and Vans. The only difference is that I don't let them look like fucking trash anymore. When I was a kid I thought shoes that looked like shit were awesome.