According to him, if you want to live long, then the idea is "not to get angry but keep a smile on your face".
He was born on 5th March 1907 in Niigata as the first of eight children of his father Haruzo and mother Miya.
He is now four years shy of being crowned the oldest man ever to live, a title which belongs to 116 years and 54 days old Jiroemon Kimura, also from Japan.
Representatives from the World Records organisation descended on the nursing home in which Mr Watanabe resides, and presented him with an official certificate recognising his achievement.
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Guinness World Records on Wednesday certified Chitetsu Watanabe, a 112-year-old resident of central Japan, as the world's oldest living man.
Born to a family of farmers in Joetsu, Watanabe moved to Taiwan at the age of 20 and spent 18 years there.
"Both Chitetsu and Tetsuo told me that getting to places and sourcing food was a struggle".
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. "Having to live under that circumstance with four young children must have been tough".
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Until about a decade ago, Mr Watanabe used to grow bonsai trees and had a collection of about 100 which he used to exhibit.
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. She lived to 122 years and 164 days before dying in August 1997.
'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'. In 1974, he and his son Tetsuo had built a new family home.
The world's previous oldest living man Masazo Nonaka died in January past year aged 113.
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