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I'm a long way past 35 and still love programming. I think those who lose interest are the ones who took it up because "it seemed like a good career". They're usually not very good at it anyway, so it's hardly surprising they get fed up.
If you do it because you find it fascinating, challenging, and fun then you're unlikely to suddenly, or even gradually, lose interest.
I gradually lose interest on all the projects I work on - from my first one when I was 23 though to the current one. When I hit the point where I've lost too much interest, I move onto the next challenge.

), so you eventually outlast some of the permies on your team. 
