If he has to make enough money to support himself then I'd say it's a bit tricky. If it's more for keeping busy and the mind sharp then yes, go for it. Especial

If he has to make enough money to support himself then I'd say it's a bit tricky. If it's more for keeping busy and the mind sharp then yes, go for it. Especially if he has a lot of domain-specific knowledge from his time in management. My grandpa learned programming, (BASIC, on a TRS 80) when he was 80 and got proficient at it quickly although it was just for fun.