Chitetsu Watanabe

Japanese supercentenarians are citizens, residents or emigrants from Japan who have attained or surpassed 110 years of age. As of January 2015, the Gerontology Research Group (GRG) had validated the longevity claims of 264 Japanese supercentenarians, most of them women. The oldest Japanese person on record was Nabi Tajima, who died on 21 April 2018 aged 117 years, 260 days. Japan was also home to the world's oldest man ever, Jiroemon Kimura, who lived to age 116 years, 54 days.

Since Chiyo Miyako's death on 22 July 2018, the oldest living person in Japan and in the world is Kane Tanaka, born 2 January 1903, age 116 years, 363 days. Since Masazō Nonaka's death on 20 January 2019, the oldest living man in Japan is Chitetsu Watanabe, born 5 March 1907, age 112 years, 301 days. Watanabe became the world’s oldest known living man following the death of Gustav Gerneth of Germany on 22 October 2019.

  Deceased   Living
Entries without a number have not yet been validated by the GRG.

Denzo Ishizaki

Denzo Ishizaki (石崎 伝蔵, Ishizaki Denzō, 20 October 1886 – 29 April 1999) was for a short time Japan's oldest living person and the world's oldest living man, from February to April 1999, and when he died the oldest Japanese man ever until being surpassed by Yukichi Chuganji on 30 September 2001. A former elementary school teacher and town assembly member, Ishizaki lived in Kansago, Ibaraki Prefecture, where he died of multiple organ failure on 29 April 1999 at the age of 112 years, 191 days.

Nabi Tajima

Nabi Tajima (田島 ナビ, Tajima Nabi, 4 August 1900 – 21 April 2018) followed Violet Brown as the world's oldest person for 217 days after 16 September 2017. She was the last surviving person from the 19th century and the Lost Generation. She died at age 117 years and 260 days and is the third-oldest person ever. Tajima is the oldest Asian to be validated by modern standards.

Tajima was born and died on the small island of Kikaijima, about halfway between Okinawa and the main Japanese islands. Her husband, Tominishi Tajima (田島 富二子), died at the age of 93 in 1991. She had nine children, seven sons and two daughters, and in September 2017 she was reported to have had around 160 descendants, including great-great-great-grandchildren. She stated that her longevity was due to sleeping soundly and eating delicious food. Guinness World Records was planning to certify Tajima as the world’s oldest person, but she died at a nursing home in Kikai City before they could do so.

Masazō Nonaka

Masazō Nonaka (野中 正造, Nonaka Masazō, 25 July 1905 – 20 January 2019) was, at the time of his death, Japan's oldest living man since October 2016, and the world's oldest living man since January 2018. Nonaka was also the oldest person ever born in Hokkaido.

Nonaka had two brothers and three sisters; he married Hatsuno Nonaka in 1931. They had five children, of whom three were living as of January 2019. He ran the family onsen, which opened in 1905, and spent most of his time in a wheelchair, crediting his longevity to eating sweets and relaxing in the hot springs. Nonaka died at home of natural causes, at 1:30am on 20 January 2019, aged 113 years, 179 days.