[10098]

What if suddenly, by the time you're 50, you find that you no longer love it, but it's the only thing you can do to put food on the table?

[snogglethorpe]

Sure, but there's nothing particularly programming-specific about that situation.

It can happen with any profession, and I can't see that it's any more likely for programmers.

[Personal note: I'm my late 40s, and have been a professional programmer my entire working life. I still love it, and can't think of anything else I'd rather do.]