Figure 12.18 Age structure for human populations in India, the United States, and Germany in 2012. The age structure of India has a high proportion of young people, which indicates a growing population. The age structure of the United States has very similar numbers of people from 0 to 50 years of age, which indicates a stable population. Germany’s age structure has fewer young people than middle-aged people, an indication that its population is declining.
Data from http://www.census.gov/population/international/data/idb/informationGateway.php.