The Land of Immortals: How and what Japan's oldest population eats
https://edition-m.cnn.com/2019/04/05/health/japan-okinawa-food-diet-hara-hachi-bu-chasing-life-gupta/index.html?r=https%3A%2F%2Fedition.cnn.com%2F
Though Japan itself is one of the countries where people live longer than average, Okinawa is outstanding in the country. As well as diet habits, I guess its society would also affect longevity.
"Nankurunaisaa" is the common word there, meaning "I won't mind such a thing."
Unlike Japan's main island, where people live under stress of extreme punctuality and precision about everything, Okinawan society is less stressful.