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

2. 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

3. 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.

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

5. 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?

6. 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

7. Male Female Male Female Zero Growth
Spain
Austria
Greece
Negative Growth
Germany
Bulgaria
Sweden
Ages 0-14
Ages 15-44
Ages

8. 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

9. 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)

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

11. Age Structure Diagram U.S.