It's Guinness World Records official: Masazo Nonaka, born on July 25, 1905, is the world's oldest living man. On Tuesday, Nonaka received a certificate declaring that at 112 years and 259 days old, he is the oldest man alive. He celebrated by eating cake with family. Nonaka lives in Ashoro, on the Japanese island of Hokkaido, and his routine includes reading the newspaper every day after breakfast and watching sumo wrestling on TV.