[5] people under 15 years of age made up over a quarter of the world population (25.18%), and people age 65 and over made up nearly ten percent (9.69%) in 2021 Each new revision presents updated data on population size by country and region, covering past estimates (from. [5] the world's literacy rate has increased dramatically in the last 40 years, from 66.7% in 1979 to 86.3% today
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The following list of countries by age structure sorts the countries of the world according to the age distribution of their population
The population is divided into three groups
Ages 0 to 14 years Ages 15 to 65 years Over the age of 65 The age structure of a country has a strong impact on society and the economy
The median age is the index that divides the entire population into two numerically equal age groups, one younger than that age and the other older than that age It is the only index associated with the age distribution of a population [1] currently, the median age ranges from a low of about 18 or less in most least developed countries to 40 or more in most european and east asian countries. World population pyramid from 1950 to 2100 (projected)
(un, world population prospects 2017) world age group populations from 1950 to 2100 (projected)
[1] population ageing is an overall change in the ages of a population This can typically be summarised in a single parameter as an increase in the median age [3] models of population growth take. Visual comparison of the world population in past and present estimates of world population by their nature are an aspect of modernity, possible only since the age of discovery
Early estimates for the population of the world [10] date to the 17th century William petty, in 1682, estimated the world population at 320 million (current estimates ranging close to twice this number) World population by broad age group projected to 2100 the united nations world population prospects (wpp) is the official series of global population estimates and projections produced by the population division of united nations department of economic and social affairs (undesa)
