Gengan Tonaki (30 October 1884 – 24 January 1997) was Japan's oldest living man from at least 1994 to his death at age 112 years, 86 days on January 24, 1997. He was the first Japanese man to indisputably reach ages 111 and 112. His record of being Japan's oldest verified undisputed man ever was surpassed by Denzo Ishizaki in 1999. At the time of his death, Tonaki was the third oldest living man, behind American men Christian Mortensen and Johnson Parks.

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