highest % of people aged over 100?

Japan leads with more than 30,000 people over one hundred years old.

The Okinawa prefecture is known for having the highest percentage of centenarians.

Okinawa highest per capita (USA & Barbados also list hig
"The United States currently has the greatest number of centenarians in the world, numbering over 55,000 in the year 2005. The U.S. number is partly a function of America's large population in 1890-1905, and an increased emphasis on long-term care facilities.

Japan is second, with 30,000. Many experts attribute this (and Japan's very high life expectancy) to the Japanese diet, which is particularly low in fats. However, relatively (per capita) higher number of Americans make it to 100 than do Japanese. In addition, five times as many Okinawans (Prefecture) live to be 100 than the rest of Japan.

The Island of Barbados, however, has the second-highest occurrence of centenarians in the world."

http://en.wikipedia.org/wiki/Centenarian

Link to info about Okinawan Prefecture's extreme longevity, diet and lifestyle:

http://www.associatedcontent.com/article/3541/the_okinawa_diet_the_key_to_longevity.html

Furthermore, issues and facts about worldwide life expectancy are found here:

http://health.howstuffworks.com/life-expectancy.htm/printable