First of all, I'm not that old, 20's - but I've found that the older I get the less games stick with me. I used to fall into them for hours and hours at a time.
Now I find that if I play for more than two hours I lose interest.
I'm not sure if it's a function of time. Full time job + responsibilities + whatever else means less time to play. When I do play, I feel like I should be doing something else. Or it could just be a function of the content itself, the price of development causing the actual game-time to stretch and become less dense as a result.
I'm just wondering if anyone else has experienced the same thing. I'm still very interested in video games, but I spend much less time actually playing them and the experience doesn't hit quite like it used to. I'm very curious for this board's opinion on it.