Unit 3.6 ~ Age Structure Diagrams

Age cohorts & growth = groups of similarly aged individuals

• 0-14 = prereproductive;
• 15 - 44 = reproductive age;
• 45 + = post reproductive
• Size difference between 0-14 & 15-44 indicates growth rate   * Larger 0-14 cohort = current & future growth   * Roughly equal 0-14 & 15-44 = slight growth/stable   * Larger 15-44 = pop. decline

• Extreme Pyramid shape = rapid growth
• Less extreme pyramid = slow, stable growth
• House = stable, little to no growth
• Narrowest @ base = declining pop. 

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