Masazō Nonaka
Nonaka died in his sleep of natural causes at age 113 years, 179 days at 1:30am on 20 January 2019, and was succeeded as the oldest living man by Chitetsu Watanabe (born 5 March 1907), although German World War II-veteran Gustav Gerneth (born 15 October 1905?) and Mexican Domingo Villa Avisencio (born 26 August 1906?) claimed to be older than Watanabe (who, however, was the oldest living Japanese man).