If 100 year olds were truly healthy, then I strongly suspect we'd see a shift in societal structure and expectations for retirement. Societies tolerances for a

If 100 year olds were truly healthy, then I strongly suspect we'd see a shift in societal structure and expectations for retirement. Societies tolerances for a permanent upper class of retirees and a permanent lower class of workers would likely not last - worker's would likely be unwilling to do the same job for a century.