The ratio of centenarians to total population and the geographical distribution of centenarians are important indexes to judge a longevity area. The spatial distribution of centenarians in Sichuan and Chongqing districts is a gathering type distribution, the Chengdu Plain has been an intensive area of centenarians and longevous elders since ancient times. The ratio of centenarians in these districts shows a decreasing trend and a stair type distribution from the western to the eastern. The northwest plateau of Sichuan and the Chengdu Plain with highest ratio of centenarians are among longevity...
