It is interesting that although more people live into their 70s and 80s today than they did hundreds of years ago we really haven't extended the human life span that much even with all the advances in medicine, nutrition, environmental control etc. John Adams lived to be in his 90s a couple hundred years ago but folks like David Bowie, Patty Duke and many others celebrities didn't reach 70 even with the best health care available in 2016.