How old are we when we’re old?
I’m well into my sixties now, but I don’t feel old at all. Or at least, no more so than I did twenty years ago. In some ways, probably because of improved diet, I feel like I’m in better shape. I do need to work out, though. I’m planning a lot of business travel this year, and starting a new space venture, and I feel as up to it (perhaps more, given my experience) as I ever have.