The average number of years from birth that a person can expect to live.
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Longevity
The increase in life expectancy over a period of time. It is a direct result of improved medical provision and increased levels of economic development. People live longer and this creates an older population.
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Birth rate
A measure of an area's fertility. It is expressed as the number of live births per 1,000 people in 1 year.
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Death rate
The number of deaths per 1,000 people in 1 year.
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Natural change
The change in size of a population caused by the interrelationship between birth and death rates. If birth rate exceeds death rate, a population will increase. If death exceeds birth rate, a population will decline.
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Card 2
Front
Longevity
Back
The increase in life expectancy over a period of time. It is a direct result of improved medical provision and increased levels of economic development. People live longer and this creates an older population.
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