Agreed - as I'm starting to get older, I have less and less time to play (27 and getting married in 6 months). So my ability to compete against 13-18 yeard olds who play incesantly just isn't there. I've always preferred to pick up a controler, play for a 20 minutes, and then be on with my day. I'm slowly but surely working my way through Resident Evil 4 (on the GC) like that right now.
Personally, online games just don't cut it for me. And I think that holds true for a large percentage of the "older" gaming community. We want to pick something up for 20 minutes, work through it, then be done with it.
And I get plenty of social interaction at both work and home so I don't feel like I need that social aspect of online gaming.