That's a good question, I guess. And I think the answer boils down to the fact that we've already accomplished many things, and it becomes ever harder to top what you've already done. I mean, I still work towards goals, but they're more practical now (or completely impractical - hobbies). I think it just comes with being at a point in life where you're comfortable - as a student, you still have to earn that comfort, and once you have it, there isn't as much to gain in doing similar things. I'll call it refined ambition. We also have many more responsibilities now, which complicates things, of course.

I mean, I tried out teaching, and failed miserably, but that was something I thought would be fulfilling.