Retirement for physical, strenuous work is different from retirement from knowledge work. Most 70/80/90 year olds would like to keep their brain sharp and no be

Retirement for physical, strenuous work is different from retirement from knowledge work. Most 70/80/90 year olds would like to keep their brain sharp and no better way than creating artifacts (that has potential value that can be exchanged). There will be a marketplace for 70+ year gig work, especially as Gen X, Millennial hit that age