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Kane Tanaka, who has twice survived cancer, lived through two global pandemics and loves fizzy drinks, will take the flame as it passes through Shime, in her home prefecture of Fukuoka.
While Tanaka's family will push her in a wheelchair for most of her 100-meter (about 328 feet) or so leg, the supercentenarian -- a person aged over 110 years old -- is determined to walk the final few steps, as she passes the torch to the next runner.
CNN spoke exclusively with Tanaka, who has a new pair of sneakers for the event -- a gift from her family on her birthday in January.
"It's great she reached that age and she can still keep up an active lifestyle -- we want other people to see that and feel inspired, and not to think age is a barrier," said her grandson Eiji Tanaka, who is in his 60s.
Previous record holders for the oldest Olympic torchbearers include Aida Gemanque of Brazil, who lit the torch at the 2016 Rio Summer Games age 106, and table tennis player Alexander Kaptarenko, who ran with the torch at the 2014 Sochi Winter Games at 101 years old.
Life of a super-centenarian
She went on to have four children with the rice shop owner she married at 19 years old, and worked in the family store until she was 103. She has five grandchildren and eight great-grandchildren.
She lived through two world wars and the 1918 Spanish flu, although her grandson Eiji said: "I don't remember her talking much about the past ... She's very forward thinking -- she really enjoys living in the present."
Tanaka is by no means Japan's only centenarian.
In Japan, women have a life expectancy of 87.45 years compared to 81.4 for men, government figures released in July 2020 showed.
"(Kane) said she wants to break that record," said Eiji Tanaka, her grandson.
Connecting generations
Tanaka's family said she hasn't been doing any training for the torch relay, but is excited to be a part of the Olympics.
"She has always loved festivals," Eiji Tanaka said.
But he warned her participation in May -- which is sponsored by a Japanese life insurance company -- will depend on her health and weather conditions.
The torch will first go through regions affected by the devastating 2011 Tohoku earthquake and tsunami, marking the disaster's 10th anniversary, before traveling "around every corner of Japan," officials said.
The coronavirus restrictions include avoiding "the 3 Cs" -- closed spaces, crowded places, and close-contact settings.
Those who wish to view the relay from the roadside must wear masks, stay home if they feel unwell, and refrain from traveling outside the prefecture they live in.
Spectators have also been told to "support with applause ... rather than by shouting or cheering." The relay will be streamed live online.
Torchbearers will be required to fill out a daily health checklist two weeks before the relay and refrain from activities that may involve a risk of infection, such as eating out or going to crowded places, officials advised.
She tweets photos of her great-grandmother enjoying treats such as cake and soda pop, and shares her achievements and the exchanges she has with her relatives.
"I started a Twitter feed on her because it's quite amazing that at 118 she drinks Coca-Cola herself and plays Othello," Junko Tanaka said. "I might be biased because I'm related to her but I think it's kind of amazing -- I wanted to share that with the world and for people to feel inspired and to feel her joy."