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How long could we live?
The oldest verified person to date was Jeanne Calment of France, who died in 1997 aged 122. Now scientists in the United States believe drugs could be on the horizon that delay the diseases of old age and increase the healthy years of life. But could such treatments also mean we live longer?
Undoubtedly, according to Aubrey de Grey, a biomedical gerontologist and probably the world's leading advocate of life extension - the belief that medical advances will enable humans to live for hundreds of years. He has ploughed millions of pounds of his own money into ageing research, and is chief science officer of the SENS Research Foundation, which has laboratories in Silicon Valley, California.
He told me: "I've yet to meet someone who wants to get Alzheimer's - ill health as a result of ageing is the biggest problem facing the world." He believes medicine is close to solving the problem: "There will certainly be no limit on how long people might live when we bring ageing under control.”