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The world's oldest man has died at his home – a hot springs inn – in northern Japan at the age of 113. Masazo Nonaka died from natural causes in his sleep in the early hours of Sunday in Ashoro on Japan's northern main island of Hokkaido, his family said. The supercentenarian, whose family has run the hot springs inn for four generations, was certified last year as the world's oldest living man at 112 years and 259 days.