Old age is cool.

According to Norman Mailer (who is 83):

There's one good thing about old age that people don't recognize. Which is that if you have a reasonable old age, as I do, in that you're not in pain, and you're not in terrible trouble emotionally with your children, or your mate, then what happens is you cool. And you finally are cool in a way that you never were before. And you realize that you won and you lost, and that's just what happens to everyone else. They win and they lose also. And what you didn't succeed in doing, you didn't succeed in doing, so f--- it....

In other words, I'm at peace with myself in a way that I wasn't for many, many years. I feel more sane than I've ever felt in my life.