I may advise against him continuing, or may not....but what I do know is many people will always strive to be productive, to give to others, to do what they do or something else more feasible. This drive for most is much stronger than the need/desire for money itself. I am always inspired by those who never stop or quit.
Neil Diamond, for one, was putting out his best stuff (imho) into his 70s, up until 2014´s "Melody Road", after which in 2018 he was diagnosed with Parkinson´s and retired.
And many others.
James