Honest, legitimate post that I very much enjoyed. However I do think posts like this feed in ageism. I say this because it posits that the change is that the author is older and has more things to do, therefore they've fallen out with technology. The take-away invariably being that people who are older and have more things to do have fallen out with technology, whereas the young are still with it, whatever it is. Let…
If I devoted my free time to technology, I would be doing so just not to become obsolete, not out of genuine interest, and that would be too frustrating. I actually have some tech interests (Scala, Hadoop, any kind of complex algorithm, etc), but when I get home, there is so much I'd rather do, that I don't program at home any more, except on rare occasions.
There is a lot of pressure to spend all your waking time on technology and things related to your work or your career (I'd say this is part of the so-called "Californian ideology", maybe I'm wrong). But, in actuality, not that much people is so obsessed with learning the same area, and the competition to not get behind is mostly illusory (ageism is another different problem; and no amount of knowledge will free you from it). So my advice here is that, if you don't feel like devoting your life to a single thing, forget about your job the very moment you close your office's door, and enjoy any other of the million things life has to offer. And of course, if you are really that passionate, keep learning new programming languages or techniques on your free time (just be careful about burnout).
Final note: the most tech-passionate guy on my job is one of the oldest (36). It's not a matter of losing it over time, it's a simple matter of people's preferences (and in some cases evolution over time).