In healthcare, the holy graille seems to be longevity. We look at whether a treatment increases lifespan and use that as a barometer for it's value.  But should that be the yardstick we use? Or would we be better off with a more subjective measure of improving quality of life, even if that means sacrificing some of the quantity. Today, 2 Docs Talk about this question propose some things to consider as you consider your approach to aging and healthcare.   Resources: Colonoscopy study in the Annals of Internal Medicine  Research on lifespan in Nature The Austad/Olshansky Wager