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Japan has aged significantly in recent decades: in 1960 the young outnumbered the old by nearly 5-to-1.In these two charts you can compare the population structure by broad age groups for two example countries: Japan and Nigeria.
Here we see that the age dependency ratio in 1970 was almost 80%: a very young demographic. Now in 2019, there are 7.7 billion. World Population Ageing 2019; World Population Ageing 2019. But these children and adolescents will move into the working-age bracket soon and share of the productive, working-age population will increase significantly in the coming decades.What is the age structure of the world population and in countries around the world? You see that in each subsequent decade the population pyramid was fatter than before – in each decade more people of all ages were added to the world population.If you look at the green pyramid for 2018 you see that the narrowing above the base is much less strong than back in 1950; the child mortality rate fell from 1-in-5 in 1950 to fewer than 1-in-20 today.Countries across the world have been going through an important demographic transition: from young to increasingly ageing populations.Whilst the total age dependency ratio is a useful indicator, understanding the breakdown of this dependency between young and old is key. By the end of the century the UN expects a global population of 11.2 billion. Represented in this way the population structure of societies with high mortality rates resembled a pyramid – this is how this famous type of visualization got its name.The timing varied significantly between countries – in higher income countries with low fertility rates and longer life expectancies, it has been shifting for decades. Submitted by MSTOCKTO on 31 January 2020 - 3:24pm . By the end of the century the UN expects a global population of 11.2 billion. facts.Everything you need to know about the industry developmentKey economic and social indicatorsReligious diversity in Middle East/North Africa in 2010, by religionAccording to the source the data from the above statistic originates from official statistical yearbooks and bulletins of the particular country. This has not always been the case as the chart shows. In low-income countries with high fertility rates and lower life expectancy this point is still many decades away: it’s projected that in Nigeria, under-5s will outnumber those older than 64 until 2087.Our World in Data is free and accessible for everyone.Help us do this work by making a donation. The ratio is much higher across many countries in Sub-Saharan Africa: Niger and Mali, for example, have a larger dependent population than they have working-age populations. A higher number means there are more ‘dependents’ relative to the working-age population; a lower number means fewer.It is common in demography to split the population into three broad age groups:Median age provides an important single indicator of the age distribution of a population. But maximising this potential needs a strong policy environment for education, health and job creation.

Since the youth share is not expected to change significantly, this means the share of the population of working-age is expected to fall further.We can also see this distribution of young and old populations across the world clearly in the two maps below. These are the question that this entry focuses on.It’s given as the number of dependents per 100 people of working-age. New York, 2020 . In the United States, under-5s were already outnumbered by those older than 64 by 1966.

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