Last updated: 24 june, 2010 - 13:49 GMT

How long could humans live?

French former nun Eugenie Blanchard poses on May 10, 2010 at the hospital Bruyn in Gustavia, on the French overseas island of Saint-Barthelemy. Blanchard was born on 16 February 1896. She died on 4 August 1997

Jeanne Calment had the longest recorded lifespan in history; she died aged 122

One Planet examines the ethical and practical implications if people begin to live for 200 years and beyond.

David Eagleman is an American neuroscientist whose book: Sum: Forty Tales from the Afterlives, imagines a world where everyone lives for centuries, even as long as beyond 300 years.

He has written a funeral speech, from an imagined future, in which a relative has died prematurely at the age of just 122 years.

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One Planet presenter, Mike Williams, visited a day centre for elderly people in south London.

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First broadcast 24 June 2010

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