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.