All this talk of stereotypes, it brings to mind that episode of Seinfeld where Jerry mentions that people used to think he was gay because he's a thin, single, neat-freak (and in later seasons, voluntarily shaves his chest), and did a bit about how if a man is big, fat, sloppy, and lazy, he must be (straight and) married. Come to think of it, stereotypes have pretty much changed somewhat since those days, because thanks to those same Hollywood nutjobs who force us to worship like size 0 stick figure women want women to worship silky, smooth, hairless men, so now, it's like men HAVE to shave their body hair so as to not to repulse women (and apparently women are happy about that, thinkig it gives men an idea of what they have to go through by constantly shaving their legs and armpits so as not to repulse men)... yeah, well, it'd take me HOURS to shave that much, I've got hair in places I didn't even know hair could grow, but that's besides the point (and I wouldn't shave like that anyway, because men ARE SUPPOSED TO HAVE BODY HAIR).
As far as character ages and changes are concerned, it all depends mostly on the writers, and/or the performers; I mean I could got into a long-winded talk about that, but I don't think I will.