It is common knowledge that China, with its 1.3 billion people, is the most populous country on the face of the earth. Fewer people, however, know that the number of senior citizens in China also ranks first in the world. An internationally accepted definition of an aging society is one where more than 10 percent of the population is aged over It is common knowledge that China, with the 1.3 pop people, is the most populous country on the face of the earth of an aging society is one where where more than 10 percent of the population is aged over