Masu Koido

Masu Koido (born 22 January 1907) is a Japanese supercentenarian whose age is currently unvalidated by the Gerontology Research Group (GRG). She is the oldest known living person in Gunma Prefecture, Japan.

Biography
Masu Koido was born on 22 January 1907 in Japan. On 26 August 2016, then aged 109, she became the oldest known living person in Gunma Prefecture, following the death of 112-year-old Mumeno Sakurai. She was reported as such in September 2016 and 2017.

Masu Koido currently lives in Minamikimura, Gunma Prefecture, Japan, at the age of.