how many 125 year old people do you know?

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I often visit health and wellness sites to keep up on new discoverioes in whole food products and vitamin supplements. I keep seeing these claims that the human body is "built to last 125 years" but doesn't because of all the unhealthful stuff we do and live with. I gotta ask, there is no possible way that every single person on the planet from yoginis, to faith healers, to Tibetan Monks out in the wily wags who have never even seen a car let alone lived in a miasma of auto exhaust all their lives, can be ab using their bodies and shaving years off of their life expectancy. The oldest human being to live in modern times got close, 122 years old http://www.wowzone.com/calment.htm, the record previous to that was 115 years old. The woman who lived to be 122 had loadt her last grandson in 1967, so she outlived two generations of her offspring. If the body is built to survive that number of years however why is it the rare occurence rather than the norm? Do you think that we are cheating ourselves out of almost 50 more years of life? If so what can we do about it?