What are demographic changes?

Demographic trends describe the changes in Demographics in a population over time. For example, the average age of a population may increase over time. It may decrease as well. Certain restrictions may be set in place changing those numbers. For instance in China with the one child policy. Worldwide, the number of people 65 or older is increasing faster than ever before. Most of this increase is occurring in developed countries. In the United States the percentage of people 65 or older increased from 4 percent in 1900 to about 13 percent in the late 1990s. ...