As for the secret to his longevity, he told a local paper previous year it is "not to get angry and keep a smile on your face".
He was born on 5 March, 1907 in the town where he now lives as the first of eight children of his father Haruzo and mother Miya.
A Japanese man, who believes in smiles and has a sweet tooth, is officially the world's oldest man at 112 years and 344 days old.
Watanabe was officially given the title at a nursing home in Niigata where he now resides.
112-year-old Chitetsu Watanabe poses next to the calligraphy reading "World's Number One" after being awarded as the world's oldest living male by Guinness World Records, February 12, 2020, in this photo released by Kyodo.
The oldest man alive attributed his longevity to "not getting angry and keeping a smile on his face".
He was also Japanese and died last month at 112 years and 266 days.
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He served in the military towards the end of the Pacific war in 1944 before returning home where he worked at an agricultural department in Niigata until his retirement. "Having to live under that circumstance with four young children must have been tough".
She cerebrated her 117-year-old birthday in January.
Watanabe is four years shy of the record for the oldest man ever, Jiroemon Kimura also from Japan who died in 2013 aged 116 years and 54 days.
Until about a decade ago, Mr Watanabe used to grow bonsai trees and had a collection of about 100 which he used to exhibit.
He lived in Taiwan for 18 years. In 1974, he and his son built a new family home, and grew vegetables and fruit there until Watanabe was 104. He's also caring. When I was working on my patchwork hobby, he was the one who praised my work the most.
He has five children, 12 grandchildren, 16 great grandchildren and one great-great grandchild, according to his family.