Which leaves me a bit cranky in the daytime, so it is a good thing I can now work from home. Office politics? Sexism? I’ve seen it all. Watching men make more money, doing less work. Reading the tea leaves as positions shuffle, listening to the kowtow and mumble of stifled resentment.

I want to tell my younger colleagues that it doesn’t matter. Except the sexism, which, like poison ivy, is deep-rooted: You weed the rampant stuff, but it pops up again.

What matters most is the work. Does it give you pleasure, or hope? Does it sustain your soul? My work as a climate activist is the hardest and most fascinating I’ve ever done. I’m too old for the dark forces, for hopelessness and despair. If everyone just kept their eyes on the ball, and followed through each swing, we’d all be more productive, and not just on the golf course.

The key to life is resilience, and I’m old enough to make such a bald statement. We will always be knocked down. It’s the getting up that counts. By the time you reach upper middle age, you have started over, and over again.

And, I might add, resilience is the key to feeling 15 again. Which is actually how I feel most of the time.

But I am too old to try to change people. By now I’ve learned, the very hard way, that what you see in someone at the beginning is what you get forevermore. Most of us are receptive to a bit of behavior modification. But through decades of listening to people complain about marriages or lovers, I hear the same refrains.