I have taken a minor step back after turning 62, for a few simple reasons:
A) I am not 'building my career' at this point, so leave that opportunity open to the young. (this is the key point) B) I just want to do technical work, I don't have any reason to be the team lead any longer. C) I don't want to spend multiple hours in planning meetings every week. Particularly making plans for products five years down the road, and having someone else be responsible for those decisions. (likewise, I would like to see the average age of our representatives come down, for the same reason)
I still enjoy the work. I particularly enjoy working with young people. I still learn something new every month.
The people I work with all know me, some have known me for twenty years, so that helps. Maintain your network, people! Your network matters.
I find far more ageism now, outside of work, than at work.
This is the truth.
I have learned to politely tolerate young people, outside of work, trying to explain to me how to use my technology. Hint: If you visit my home, I hand you a photo with a QR code of the guest network, and I expect you know how that works. But when I go to restaurants, I have to tolerate an overly cheerful hostess explaining to me how QR code menus work.