Following the death of 112-year-old Yasutaro Koide in Japan, the oldest man in the world is now most likely an Israeli Holocaust survivor, Yisrael Kristal, also aged 112.
From the Jerusalem Post:
A grandson of Yisrael Kristal was contacted this week by the Gerontology Research Group based in the US following the death of Yasutaro Koide in Japan.
According to the organization, Kristal is now the oldest living man on record although this still has to be validated by his documentation.
He has in his possession his marriage certificate from the 1920s but it is unclear as yet if this will suffice to formally register him as the oldest man in the world.