e/Demographic window

Information
has gloss	eng: Demographic Window is defined to be that period of time in a nation's demographic evolution when the proportion of population of working age group is particularly prominent. Typically, the demographic window of opportunity lasts for 30–40 years depending upon the country. Because of the mechanical link between fertility levels and age structures, the timing and duration of this period is closely associated to those of fertility decline: when birth rates fall, the age pyramid first shrinks with gradually lower proportions of young population (under 15s) and the dependency ratio decreases as is happening (or happened) in various parts of East Asia over several decades. After a few decades, low fertility however causes the population to get older and the growing proportion of elderly people inflates again the dependency ratio as is observed in present-day Europe.
lexicalization	eng: Demographic Window
instance of	(noun) a statistic characterizing human populations (or segments of human populations broken down by age or sex or income etc.) demographic

Media
media:img	Inverse Dependency Ratio - World Regions - 1950–2050.png