a relatively high concentration of people in the childbearing years. For example, the absolute numbers of people in developing countries will continue to increase over the next several decades even as the rates of population growth will decline. The absolute numbers of people in developing countries will continue to increase over the next several decades even as the rates of population growth will decline. This phenomenon is due to past high fertility rates, which results in a large number of young people. As these youth grow older and move through reproductive ages, the greater number of births will exceed the number of deat!
             hs in the older populations (World Bank 5). Nearly one half of the population growth in the next fifty years will come from population momentum. These people are young teenagers and they are the majority of the current population.
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