Cohorts: Pre-reproductive (0-14), Reproductive (15-44), and Post-reproductive (45+).
Growth Models: Extensive base (Pyramid) = Rapid Growth. Straight sides = Stable. Narrow base = Declining.
Replacement Level: TFR (Total Fertility Rate) of ~2.1 is needed to keep a population stable.
Tags
DemographicsPopulationTFRPyramid
Load Presets (Demographic Transition)
Rapid Growth: A sharp pyramid shape. Wide base indicates huge pre-reproductive cohort entering child-bearing years soon. Typical of developing nations. High TFR.
Custom Age Adjustment
0-14 (Pre-Reproductive)45%
15-44 (Reproductive)40%
45+ (Post-Reproductive)15%
AP Exam Tip
You must predict future population trends exclusively by looking at the width of the bottom group (0-14) relative to the middle group. A wide bottom guarantees an explosion of babies in the next 15 years (Population Momentum)!