He stayed in Taiwan for 18 years and married Mitsue, with whom he had five children.
He was presented with a certificate on Wednesday at the nursing home where he lives in Niigata, Japan - he's 112 Years, 344 days old, according to Guinness.More news: Trump thanks Justice Department for softening sentence request for ally Roger Stone
TOPSHOT - In this Japan Pool picture received via Jiji Press on February 12, 2020, 112-year-old Japanese man Chitetsu Watanabe poses next to calligraphy reading in Japanese "World Number One" after he was awarded as the world's oldest living male in Joetsu, Niigata prefecture.
Yoko Watanabe explained Mr Watanabe's comments further when asked by Guinness representatives, and said that despite living with him for over 50 years she has never once seen him raise his voice or get angry. He was also in the military in 1944 near the end of World War II.
The previous record holder, Masazo Nonaka, another Japanese, died last month. "Having to live under that circumstance with four young children must have been tough".
While he isn't the world's oldest living person, what's intriguing is that the individual holding the GWR certificate for that title is also from Japan, a woman by the name Kane Tanaka.More news: Adebayor joins former Man City team-mate Santa Cruz at Olimpia
Watanabe worked at his farm until he was 104 years old.
"I think having lived with a big family under one roof, mingling with his grandchildren and great-grandchildren, helped keep a smile on his face as well", she said. He also grew fruit and vegetables on the family farm.
The world's previous oldest living man Masazo Nonaka died in January a year ago aged 113.More news: Billie Eilish releases new James Bond theme song