The world's oldest man, a Japanese, has died at the age of 112, two months short of his 113th birthday.Yasutaro Koide was born on March 13, 1903, and said his secret to a long life was not to overdo it, or drink or smoke.He was a native of Nagoya and worked as a tailor when he was younger. He became the world's oldest man in August.In Japan, 111-year-old Tokyo native Masamitsu Yoshida, born on May 30, 1904, succeeds Koide as the oldest man. It was not immediately known whether Yoshida is also the world's oldest male.