The world's oldest living person, 117-year-old Misao Okawa, died early Wednesday morning of natural causes, NBC News reported. The nursing home in Osaka city where Okawa had been living told NBC news that she had recently started to eat less and was worried about her condition. Okawa's passing comes a little less than a month after she celebrated her birthday, surrounded by her 92-year-old eldest son and his family, as well as the local media.