You can't take it with you, or, why I can't play old games

First, let me start out by saying that I hate the term "retro games."  Actually, I should rephrase that and say that I hate when people generalize the term.  You aren't playing retro games when you go back and play Super Mario Bros 3 on a dusty old NES.  Super Meat Boy is a retro game in that it's a game stylized after a game of the past.  So this post isn't going to be about retro games, it's going to be about old games.
Recently, websites like Good Old Games, Impulse Games, Steam, GamersGate and Direct2Drive have helped to start a renaissance, of sorts, for people to discover games of yesteryear.  I, myself, have fallen victim to this a few times, purchasing games simply because it was "too good of a deal to pass up."  Unfortunately, there seems to also be a tax that comes along with these great sales, in that I rarely seem to go back and play most of the games I purchase.  Of the games I've bought in the last year that can be considered "classics," I may have played about 25% of them.
So why can't I play them?
I guess maybe it's related to the fact that I'm getting older.  I don't have near as much time to play games like I used to and the time that I do have to dedicate to gaming are usually spent playing a myriad of new games.  Maybe that's another reason I have so much trouble going back to these old games.  The market is currently SWAMPED with Triple A titles, Smaller, less intensive games and generally just a ton and ton of games.  And it's not as if there is nothing but crap out on the market.  Some of these games are really good.
I find that, if I make an attempt to go back and play some of these games, that I get bored easily with dull stories, or frustrated with control schemes that make no sense.  Gaming has evolved so much in just the short amount of time it's been around and, because of that, the older games seem to have aged really poorly.   Now, don't get me wrong, there are certainly some games that I can always go back to, no matter how long it's been (in fact, I think I've been inspired to make a list) but for the most part, I convince myself that I can play them, and then spend most of the time pondering why I thought that was possible.
Has anyone else experienced this?  Am I in the minority?  I'm I just becoming an old man?