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Around the world people are living longer lives. Half of all people born in industrialised countries today, for example, can expect to live to one hundred. Some scientists say it's only a matter of time before ageing itself can become a treatable condition. Newshour's Owen Bennett Jones has been hearing from one of the leading scientists in this controversial field of research. Aubrey De Grey is an English Biomedical Gerontologist. He asks if one day people might not die from natural causes. (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)