As a developer that is much closer to 50 than many here are, I can say that it's a crapshoot whether I will be programming when I'm 50. I tired of it after a handful of years, but decided to stay on with it because I can't afford the paycut, and am still am going with it, getting close to 15 years now. But everyday, and I've tried another employer, I still can't stand it. I enjoy the freedom and art and creativeness, but when things don't work, which happens a lot, I waste time on it and feel stupid and depressed. Feeling smart 1% of the time and stupid 99% of the time and worrying about whether you will be able to continue it without getting fired is a horrible way to live. It has affected my health, my attitude, and makes me drink more than I should at times. But, we justify this with "we are making a good living".
Common things I think about doing are (1) buying and running a bar, but then I would have to deal with the alcoholics, prostitution, drugs, and other crap that goes with it (not worth it) and would feel that I was contributing to an evil in our society even though I love beer and good times, (2) selling old computer equipment and games (there is little money here, and I'm not a hardware expert, so screw that), (3) getting involved with my church (but they don't need more IT, I'm a developer anyway not IT, and I have no idea what else I have to offer), (4) helping humanity get into space (but I have little to offer there also), (5) developing Indie games (which I've done in the past to some extent, but I think that writing games just means that people will waste time away from their family and solving problems playing them), (6) going to work for a non-profit development group (but I'm a conservative, and I can't work with tree-huggers even if I have a very liberal opinion that software should be free or open source, which I realize is not the same). So instead, I take care of my family.