3.1.3 Age Sex Pyramids

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

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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
  populations growth trends, but can point to
  future social conditions.

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• Why would a countrys 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?

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Rapid Growth Guatemala Nigeria Saudi Arabia
Slow Growth United States Australia Canada
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Zero Growth Spain Austria Greece
Negative Growth Germany Bulgaria Sweden
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Developing Countries
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Developed Countries
85 80-85 75-79 70-74 65-69 60-64 55-59 50-54 45-4
9 40-44 35-39 30-34 25-29 20-24 15-19 10-14 5-9 0-
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Male
Female
Age
300
200
100
0
100
200
300
Population (millions)
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CANADA
UNITED STATES
INDIA
AUSTRALIA
MEXICO
CHINA
Fig. 46.15, p. 827
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Age Structure Diagram U.S.