3.1.3 Age Sex Pyramids

1. 3.1.3 Age Sex Pyramids

2. Show the proportion of the population (or of each sex) at each age level. Age/Sex Pyramids

3. Male Female Ages 0-14 Ages 15-44 Ages 45-85+ Demographer usually plot % or # of male and females in the total population in each of three categories: • Pre-reproductive (0-14) • Reproductive (15-44) • Post-reproductive (45 and up)

4. Age/Sex Pyramids help demographers determine the potential for future growth of a specific age group as well as that of the total population . The overall shape of the pyramid indicates potential growth. Age structure diagrams not only reveal a population’s growth trends, but can point to future social conditions. How does Age Structure Affect Population Growth?

5. Male Female Male Female Male Female U.S. Congo Germany

6. Why would a country’s leaders want to know the proportion of the population in different age groups? What difference does the age of the people in a country make? What kinds of products do young people use? Older people? Is it important for a government leader or planner to know the age of population they are serving?

7. Male Female Male Female Ages 0-14 Ages 15-44 Ages 45-85+ Rapid Growth Guatemala Nigeria Saudi Arabia Slow Growth United States Australia Canada

8. Male Female Male Female Ages 0-14 Ages 15-44 Ages 45-85+ Zero Growth Spain Austria Greece NegativeGrowth Germany Bulgaria Sweden

9. 85+ 80-85 75-79 70-74 65-69 60-64 55-59 50-54 45-49 40-44 35-39 30-34 25-29 20-24 15-19 10-14 5-9 0-4 Male Female Age 300 200 100 0 100 200 300 Population (millions) Developing Countries

10. Developed Countries 85+ 80-85 75-79 70-74 65-69 60-64 55-59 50-54 45-49 40-44 35-39 30-34 25-29 20-24 15-19 10-14 5-9 0-4 Male Female Age 300 200 100 0 100 200 300 Population (millions)

11. CANADA UNITED STATES INDIA AUSTRALIA MEXICO CHINA Fig. 46.15, p. 827

12. Age Structure Diagram U.S.