This one is easy. "Old" starts about ten years older than whatever age I am.

Seriously, though, I know I don't heal as quickly as I did twenty years ago; I'm physically less flexible; I have some complaints that come with the mileage on my body. But in everything else, I was an idiot then (OK, I was even more of an idiot then). In fact, the case could be made that I'm younger now than I was in my thirties: I'm in better physical shape; I'm more flexible in every other way than physical; I'm willing to try more stuff; I'm more openminded generally.

We get a series of gains and losses in life. It's too simple to say that "when one door closes, another opens"; the door that opens may lead to a place we'd rather not go! Maybe I've just been lucky enough to be satisfied with what I have. But my life is good, and it looks like it will continue that way.