From 2006:
Like many people, my life has been a series of goals, a things-to-do list, and at fifty I now find myself in the position, at once pleasing and disconcerting, of having accomplished most of them. As for the things I haven’t yet done, nearly all of them are things I’m no longer likely to do, assuming I ever was: I doubt, for instance, that I’ll learn a second language or write a novel or become a father. I could spend the rest of my life running in place, and I suppose that would be perfectly fine. Except that I know it wouldn’t. The time will come, if it hasn’t already, when I’ll want to try my hand at something new—and I haven’t the slightest idea what it might be….
Read the whole thing here.