I'd say that aging is programmed into the human genome to make way for (hopefully better adapted) offspring to proliferate and better continue the species. There are indications that an aging cell is not always a bad thing, and if inflammation is held in check, a type of cancer preventative (partially indicated by telomere research?). I believe science will learn to extend life but never achieve immortality, unless portions of us are replaced by cyborg parts. We should learn to age gracefully, and embrace aging as part of the great and wise circle of life.