I think about this a lot, but my thoughts always go to aging. As long as my mind and fingers still work, I can work on a computer until I’m old and gray. The physical requirements are minimal. Could you shadow your neighbor (or someone else in the trade you be interested in) for a few days to get a better idea of the realities of the job and if you’d enjoy it? Also, pay attention to their frustrations and issues and…
This is a big assumption. Why would they hire an older guy? They can have cheaper people more willing to put up with BS by hiring under 5 yoe or offshore.