A A hundred years ago, not many people lived into their seventies. Today it is fairly common to do so in developed countries. But on the Japanese island of Okinawa, people live longer than anywhere else in the world, with an average life expectancy of 81,2 years. Many people on Okinawa live to be over 100 years old – the highest ratio of centenarians per head of population in the world. And they just do not live longer, they live better.