I used to be a big gamer, now I don't game at all really. I have no consoles of my own and only occasionally play xbox 360 at friend's places. I am 26 now and my lack of gaming has nothing to do with any outside influences like work, women, friends, etc. Only from lack of interest. Sure, games can be fun...but they just don't seem that great anymore.
For anyone where this applies: this "phenomenon" is very similar to when you turn 21 and can drink legally. At first you are a crazy bastard, partying it up. As time goes by though, it becomes not nearly as much fun as it once was. I still drink and party, but not near as much as I used to. Then again, I was fairly notorious for being able to consume way too much alcohol in short amounts of time. Lol I passed out before parties were even halfway over countless times.