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Metformin is a drug widely used to treat diabetes and costs less than 20 cents a day. It is now believed to slow the natural process of ageing. Professor Craig Currie is from Cardiff University and a lead author of a study on the effectiveness of Metformin. ( Photo: 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, Okinawa Prefecture. Credit: AFP/Getty Images)