Buona notizia per il pianeta!

Link articolo originale

Archivio di tutti i clip:
clips.quintarelli.it
(Notebook di Evernote).

The world population is changing: For the first time there are more people over 64 than children younger than 5May 23, 2019 by Hannah RitchieOur World in Data presents the empirical evidence on global development in entries dedicated to specific topics.
This blog post draws on data and research discussed in our entry on World Population Growth.Countries across the world have been going through an important demographic transition: from young to increasingly ageing populations.In 2018 the number of people older than 64 years old surpassed the number of children under 5 years old. This was the first time in history this was the case.1 We can see this transition clearly when we look at the population by age bracket in the chart below – this is shown from 1950 onwards, with UN projections to 2100.In the chart below you can explore the projected age structure of future populations – for any country or world region. Just click on Change Country in the bottom left.19502100chartdatasourcesGoing beyond the global perspective, when did this crossover point occur in countries around the world?The timing varied significantly between countries – in higher income countries with low fertility rates and longer life expectancies, it has been shifting for decades. In the United States, under-5s were already outnumbered by those older than 64 by 1966. In Spain it was 1970; in South Korea it was 2000.For many countries, this crossover point is still to come. In India, it’s projected to be 2028. In South Africa, it’s expected to happen in 2036. 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.The number of children under 5 years old is projected to peak and plateau for most of the 21st century. And as the global population of people older than 64 years will continue to grow, it’s clear that we’re moving towards an ageing world.

FootnotesThe data below only extends back to 1950: why do we think that the under-5 population has been larger than those over 65 years old throughout our history? High fertility rates have been a constant in our history, with the average number of births per woman at 5, 6 or higher. Average life expectancy was also been relatively low throughout much of our history: a low share of the population lived to the age of 65. This equilibrium of high fertility and high mortality represents the first stage of the demographic transition; the population pyramid at stage one is characterized by a wide base (lots of children) and a very narrow top (few people living to older age). This equilibrium was a constant for most of our history until very recently.