Population Age Structure Diagrams Population Age Structure Diagrams

Population Age Structure Diagrams

Population Age Structure Diagrams A) Categories 1. Post reproductive(45 -85+) 2. Reproductive(15 - 44) 3. Prereproductive (0 -14 yrs)

B) Rapidly expanding structures (broad based pyramid) -high birth rate - commonly experience shortages of food, water, and energy

What environmental challenges do rapidly growing countries face? High Unemployment Increased Poverty / Hunger Energy Shortages Air / Water Pollution High population growth What shape best describes the graph above?

Stable Age Structure Diagram 1. Low Growth rates (0. 3)- rectangular shaped 2. 15 - 25% in Prereproductive Age Group 3. Ex: Sweden, U. S. , Canada, Australia.

What type of growth is most likely? What shape do demographers use to describe this age structure?

D) Negative Growth 1. birth rates are much less and the population is declining 2. diagram has a narrow base 3. Age structure: 14% under 15 years of age 3. 4. Examples include Japan, Russia, and Germany

What challenges do declining populations face? Labor Shortages A need for immigration Decreased productivity

China

Why do some sub-Saharan countries have decreasing populations? What may be inferred from this age structure diagram?

Questions 1. Which diagram indicates a population that will most likely increase sharply? 2. Which diagram best characterizes world population?

E) Age Structure Diagram Applications

1. Marketing tool: used to identify needed goods and services of society 2. Used to predict areas of job growth 3. Useful for comparing one population with another

E) Baby Boomer Impact

1. Dominate demand for goods and services 2. Influence elections/ legislation 3. Generate need for service jobs now