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Scientists in the UK say they've developed a blood test to calculate how quickly someone is ageing. Professor James Timmons from King's College in London - the researcher who led the study- has been telling Â鶹Éç Newsday what the blood test is all about. (Picture: an elderly women troupe of singers and dancers from Kohama Island in Okinawa wearing traditional local costumes perform at a herb garden on Kohama Island. Credit: Toru Yamanaka AFP/Getty Images)