expected response...but the point was that many teachers choose to retire early, and on the whole their bodies are fine.  The point that was being made is that for those with more physical jobs their bodies may well be more worn out  and they may need to have an earleir retirement, yet in my experience it is teachers who retire at 55, mainly because they can afford to becvause they have been on higher wages and get a good pension, not because their bodies have had enough.  The notion that because the population as a whole live longer so people can do physical jobs for longer doesn't stand up. The body has limitations, so people may well be living in pain for longer.