Your job description skills matter, but only if you also are a functional alcoholic who is addicted to playing online games for 30+ hours a week in addition to working 60+ hours a week.*
Startup is Mother. Startup is Father.
* I write this out of bitterness because I don't drink or play video games, which oddly I feel disqualifies me from working many places. "Oh, you don't play xbox? That's okay, I guess. The entire company gets together for six hours on Friday to drink and play marathon games though."
Sure you can game in moderation, but if you do so you won't be a gamer. I think I average maybe a handful of hours a month playing games, and that is as much as I will ever see myself caring to spend on them. There is no way for me to relate to people who call themselves gamers.
I'm not sure what preconceptions you have about "gamers" are, but from what I know, most gamers are in their 30's and have lives outside of video games.
I wouldn't call myself a "gamer", as per your definition, but I've loved playing video games since the early 80's, which might not register with your experience. I'm an ordinary guy with a beautiful wife and kids. Not sure what your beef is.
I'll play video-games on occasion but to be able to pass myself off in that sort of gamer culture is I think impossible unless you are willing to glue yourself to a television for hours and hours a week.
Other types of "frats" do not need that level of dedication I think.
For me, work is about doing something that produces value for the shareholders so they can afford write me a paycheck on a regular basis. When I've finished doing that, I'd like to use my time the way I see fit, thank you very much.
Ugh I hate that. This one time, there was a few hours to bridge between the end of the work day and the start of the office Christmas party (presumably because some management guys had to drive back from out of town). The other programmers quickly set up a multiplayer Starcraft game and later an FPS deathmatch. I quickly found out both types of games are not a lot of fun unless you possess a modicum of skill in them (unlike, say, Tetris or 1000 Blank White Cards).
So maybe it's not the narcissists are limited by age, but rather that age limits narcissism.