Its hard to do primate dominance rituals on "dad" or "grandpa" and the managers are probably in their 30s. So standard employment is not going to work.

He should consult, that was what my father was driven into, more or less for the same ageism stuff. I'm in my 30s and working a "regular corporate job" and I suspect its the last job I'll have for similar reasons. Contract / consultant work really isn't all that bad.