Aging is, effectively, a weakening process. Unfortunately, natural selection does not concern itself with cultural or moral sterility. It concerns itself with one thing, and that is survival. Unfortunately we are not discussing myths here, nor are we discussing murder. We are discussing preprogrammed death, not death by other causes.
Death is necessary for life.
Death revitilizes life. But this has nothing to do with death arising by natural selection. How it arose by natural selection is the question at hand, not that it exists or is necessary. I don't, however. Moreover, I still see no evidence to change my view.