http://www.census.gov/population/international/data/idb/informationGateway.php and clicking on “Population Pyramid Graph” in the section labeled “Select Report.” Also calculate the average age and the dependency ratio for those two dates. “Read” the age structure, discussing the implied history of population growth, and the implications for the future of the current cohort structure. What is the number and proportion of older people in the population, and how have those figures been changing over time? How are older people treated? Are there differences in sociodemographic characteristics between the young and old in society that would suggest a source of future social change as new cohorts flow into the older ages? What is the sex ratio at the older ages, and how do you account for it?