Denzo Ishizaki Ishizaki Denzo, October 20, 1886 – April 29, 1999) was for a short time Japan's oldest person and the world's oldest man. He lived in Ibaraki Prefecture. Ishizaki became the world's oldest recognized man following the death of American Walter Richardson on December 25, 1998, who was 113. He became Japan's oldest person following the death of Yasu Akino on February 12, 1999, who was also 113. Ishizaki died at the age of 112 years 191 days. As world's oldest man, he was succeeded in title by then Spanish 111-year-old Antonio Urrea-Hernández, and, as Japan's oldest person, Ishizaki was succeeded by another 111-year-old, Kamato Hongo.