Somehow I feel the key to staying relevant is not programming skills but choosing a practical domain where the software is implemented, and becoming an expert i

Somehow I feel the key to staying relevant is not programming skills but choosing a practical domain where the software is implemented, and becoming an expert in it. Mine's CAD. We have ton of older people, and no age discrimination that I can tell. I'm not sure if this works in other fields. Probably in lots of niches.