Ray Kurzweil

Extending human life expectancy is not a new story. When our genes evolved thousands of years ago, it was not in the interests of the species for people to live past child-rearing, as resources such as food were in very short supply. So a thousand years ago, human life expectancy was in the 20s. It was only 37 in 1800. In the West it is now pushing 80, and we have been adding about three months each year for the past several decades.