Yeah, I was thinking about you while I wrote this, actually, because I know we've talked about similar things.
Some people grow out of it or don't need to define themselves by it anymore. (Like Benji.) And some people, it grows with them. I think that there's way to bring that whole rebel/individualistic/live for music aspect to an adult level, and as long as your mentality grows, it doesn't have to be just for teens. Like Rise Against.

After all, if becoming an adult = conforming than it would be a pretty sad world.