I am not a programmer but my father is. He is currently in his lately sixties and coding since the punchcard. He has work all over the country and gone wherever

I am not a programmer but my father is. He is currently in his lately sixties and coding since the punchcard. He has work all over the country and gone wherever the work was. He had recruiter after recruiter contacting him. The gaps between gigs started getting longer and longer. He was on top of his game, stayed current, but yet it became incredibly hard to get a job. He has thrown in the towel and is now retired. Not because he wanted to, but because he had to. Nobody would hire him. I don't have an answer to this other than anedoctal evidence. I suspect that it will become less of a problem than it is today as the current younger programmers age. Just a guess, maybe blind hope.