摘要
By 2050,there will be 2.2 million centenarians[in the world,compared to 135,000 in 1998],that is one of every 5,000 people.The largest centenarian population in 2050 is projected to be in China.By 2050,Japan will have the highest proportion of centenarians,2.6 per 1,000 of the total population.
