One problem facing evolutionary theories that explain the characteristics of human aging is the fact that we continue to live for so long after we can't reproduce. As noted by Betterhumans, a new study offers a plausible explanation for this longevity. As a social species, we continue to help our genes spread even when we can no longer reproduce. There's more to it than that, of course, but the details given in the article are fairly convincing. It certainly merits further work and investigation. This doesn't get us any closer to curing aging, of course, but there's no such thing as useless information in the larger picture.