Demographic Window is defined to be that period of time in a nations demographic evolution when the proportion of population of working age group is particularly prominent. The exact technical boundaries of definition may vary. Typically, demographic window lasts for 30-40 years depending upon the country.
The UN Population Department has defined it as period when the proportion of children and youth under 15 years falls below 30 per cent and the proportion of people 65 years and older is still below 15 per cent.
Europe's demographic window lasted from 1950 to 2000. Much of Africa will not enter the demographic window until 2045 or later.
Societies who have entered the demographic window have smaller dependency ratio (ratio of dependents to working-age population) and therefore the demographic potential for high economic growth.
Proceedings of the United Nations Expert Meeting on World Population in 2300
Bloom, David E., David Canning and Jaypee Sevilla (2003)- The Demographic Dividend: A New Perspective on the Economic Consequences of Population Change.
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