Figure 2.25: Population pyramids for the United States and Canada, 2012. The “baby boomers,” born between 1947 and 1964, constitute the largest age group in North America, as indicated by the wider middle portion of these population pyramids.

[Source consulted: International Data Base, U.S. Census Bureau, at http://www.census.gov/population/international/data/idb/infromationGateway.php]