Another "old" gamer here.
Essentially, nothing has changed for me about gaming. I have much less free time to play, but when I do I play for exactly the same reason I played when I was fifteen; I enjoy it and I can.
I now have the possibility of buying a massive alienware and not really feeling the hit on my account. The cost of the games' themselves is negligible (and I do remember having to save money for long weeks to buy them).
I don't think the reason for finding fewer older games is that people stop playing, I think it's much more related to the fact than when we were much younger the number of gamers was really little, so it's natural that right now there's fewer of us; we were fewer from the start. However, nowadays being a gamer is much more common, so I think the companies will cater to older gamers more and more as years pass.
And when the current number of young gamers turn into economically comfortable advlts, game makers will have a much larger budget. Non-gamers will be sad people in their grey worlds while we run around in our fully immersive virtual Brink 12: The return of the Brinkmaster.
Nicely explained no doubt.
I think though that i disagree a bit with the last part,the "grey world",i mean everything is good,as long as u enjoy doing it,the thing with the internet gaming is that u get the chance to talk/meet/discuss to people that in other sircumstances u would never meet in your life.
The non-gamers i'm sure are doing interesting staff too.