Age Structure Diagrams

Age Structure Diagrams

shape tells us the population growth rate

the more young people in the population —> the faster the population will grow

Age Cohorts and Growth

groups of similarly aged individuals

0-14 = preproductive

15-44 = reproductive age

45+ = post reproductive

Size Difference Between 0-14 and 15-44 Indicates Growth Rate

larger 0-14 cohort = current & future growth

roughly equal 0-14 and 15-44 = slight growth/stable

larger 15-44 = population decline

Extreme Pyramid Shape

rapid growth

Less Extreme Pyramid

slow, stable growth

House

stable, little to no growth

Narrowest at Base

declining population

1. Preindustrial

high birth rate, high death rate throughout life

population grows slow, high infant mortality rate

2. Transitioning

high birth rate, declining death rate

access to better health care, population grows fast

3. Industrial

lower birth rate, high survivorship high death rate in late life

reduction of population growth rate

4. Post Industrial

low birth rate, high survivorship, low death rate

birth and death rates are stable