This is especially true in the bedroom. If high-quality, frequent sex that pushes the limits every so often (because you're always trying new ways to please your S.O.) is what makes your motor run, DO NOT settle for a low-libido, low sexual curiosity partner, no matter what their other attributes may be.
This poster ended three live-in arrangements because...they couldn't keep up. If your issues can't be addressed, I'll not be held hostage.
And here's the absolute truth: Life is too damned short to spend with someone who doesn't ring your chimes every time. IME, focusing on your partner's pleasure usually gets appropriate reward. After a while, it becomes habit, and if you're smart, you're always looking to up your game, it becomes a self-propelling process.
My wife and I moved into the BDSM realm in the late nineties. And in answer to OP's question, we were in our early forties, married ~14 years. We had been sexually compatible (and more) since day one. She knew how to follow a lead, and besides being true best friends, we were/are crazy about each other. So one night a few months after we had introduced leather paddles, rope, and some other toys, she was kneeling on the edge of the bed in stockings, heels, and corset, I was facing away, at a slight angle from her ass, and suddenly decided to give my lovely wife an open right palm, delivered backhand to her left cheek. She made an "Ohhh" sound that she swallowed as she said quietly, but clearly, "Thank you, Master".
Eternity went by for a minute. Then I picked my head up and spun it back on, and gave her one on the other side.
Every time we play, we go for 2-3 hours or more. She usually falls asleep as soon as I let her. Sometimes before, heh.
TL:DR, I can't do all the things I did X years ago. But what I can do now (which is more satisfying for my partner) for hours at a time I didn't even know about X years ago.
I have found it true: Experience and guile will always overcome youth and strength.