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

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Presentation transcript:

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

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) Male Female Ages 0-14 Ages 15-44 Ages 45-85+

How does Age Structure Affect Population Growth? 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.

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

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?

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

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

Population (millions) Developing Countries 300 200 100 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 Population (millions) Age

Population (millions) 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 300 200 100 100 200 300 Population (millions)

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

Age Structure Diagram U.S.