The world's oldest man, a retired educator from Japan, has died at the age of 112.

An official from the city of Saitama said today that Sakari Momoi died from kidney failure yesterday at a nursing home in Tokyo.

Mr Momoi was born on February 5, 1903, in Fukushima prefecture, where he became a teacher. He later moved to Saitama, north of Tokyo, and served as a high school principal until retirement.

Mr Momoi was certified by Guinness World Records as the world's oldest man in August 2014, when he was 111.

Another Japanese man, 112-year-old Yasutaro Koide of Nagoya, succeeds Mr Momoi as the world's oldest man, according to the Los Angeles-based Gerontology Research Group.

The world's oldest person is an American woman, 116-year-old Susannah Mushatt Jones of Brooklyn, New York.