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Life expectancy

Health trends
People tend to live longer when they have access to good health care and health facilities.
In those countries where access to health care is inferior, people do not live all that long. Because of technological development in different countries, people appear to be living longer and longer.
As the years go by, we expect to find that in the more developed countries, life expectancy could reach the age of 80 or 90 years. In less developed countries, that includes Africa, life expectancy is still on the low side.
Discuss five technological developments from the least 50 years which has had the biggest impact on expectancy.
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