Objective:Health: What Signs of Aging are Actually Due to Aging?

So often we hear that it is totally normal for people to succumb to ailments and issues as they age. Despite the fact that even our recent ancestors didn't seem to suffer a complete degradation of their bodies as they aged, today we're told that chronic diseases are just a consequence of living longer (even though, on average, we're only living 5 or so years beyond what our previous generations lived). How much of what we consider 'normal aging' is actually the consequence of a lifetime of...