A Japanese woman went into the record books as the world’s oldest woman after she died on Saturday at the age of 115 at a nursing home in the city of Kawasaki, south of Tokyo. Born on December 24, 1897, Koto Okubo had been accorded the title of the oldest known woman on December 17 only after Dina Manfredini, also 115, died in Iowa on December 17. Japan has one of the longest-living populations in the world. The number of people aged 100 or older surpassed the 50,000 mark in 2012 for the first time ever.