From "an open source mind blog": "Aging isn't a roadblock created by one inefficient system in the body. No system of the body had [evolutionary] pressure to create a perpetual repair mechanism and so every system of the body decays. ... Any individual that spent energy on repair would have been more likely to have been eaten by a saber tooth tiger or stomped by a mammoth. Modern life spans, then, are a function of historical danger. ... We don't age because its advantageous or nature wills it. Its simply because nature, until now, had no reason to do anything about it. Today, however, scientists are taking charge and developing the ability to increase human life span exponentially. Researchers like Aubrey De Grey are finally looking at aging as a very serious problem instead of an inevitability. That we can postpone aging is certain. The speed at which we develop these technologies, however, will depend on how quickly universities, scientists, funding boards, and the public adopt this same view on aging."