Masao Kadoguchi

• Full name: Masao Kadoguchi (Japanese: 門口正雄)
• Lifespan: (07.09.1915 – 27.01.2026)
• Age: 110 years, 142 days
• Birthplace: Japan (Kagawa)
• Last residence: Japan (Nagasaki)
• Application date: 14.09.2025
• Validation date: 09.10.2025
• Validation source: MHLW Japan/Brian Hsu

Biography

Masao Kadoguchi (Japanese: 門口正雄) was born in Kagawa Prefecture on September 7 1915.

In September 2025 he celebrated his 110th birthday, gaining supercentenarian status.

He passed away in Nagasaki Prefecture, where he was the oldest known living man, on January 27 2026, aged 110 years, 142 days.

Validation

His age was verified by MHLW Japan and Brian Hsu, and validated by the Gerontology Research Group (GRG) on October 9 2025.