[__d]

Depending on your interests, embedded systems programming might be an opportunity worth pursuing.

In my experience, it's much more a stable "stack" than most other areas, and there are plenty of programmers who continue to work (and get well paid) as they get older.

Investing some time with a Raspberry Pi and a couple of micro-controllers at home will get you started on the skillset, maybe some Open Source contributions as a way into the community?