Demographic Window + Demographic Dividend
Demographic window is that time period in a country’s demographic evolution when the proportion of the working age group in especially prominent. This happens when the demographic architect of the population becomes younger and the share of people who can work reaches the maximum. Countries in the demographic window of opportunity have smaller dependency ratios.
Demographic dividend is the period when the rates of fertility come down due to great curtailment in the child and infant mortality ratios. This period usually lasts for twenty to thirty years. As families and women start to realize that fewer children would die during childhood or infancy, they begin to produce fewer children so that the desired number of offspring is reached. This further reduces the proportion of dependents who are non-productive.