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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: children. Ages 15 to 64 years: working population or adults. Over the age of 65: elderly, senior citizens.
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. [8] The world population more than tripled during the 20th century from about 1.65 billion in 1900 to 5.97 billion in 1999.
The birth rate is 11.0 births/1,000 population, as of 2020. [82] This was the lowest birth rate since records began. There were 3,613,647 births in 2020, this was the lowest number of births since 1980. [82] 11.0 births/1,000 population per year (final data for 2020). 11.4 births/1,000 population per year (final data for 2019). [82]
Statistical subregions as defined by the United Nations Statistics Division [1]. This is the list of countries and other inhabited territories of the world by total population, based on estimates published by the United Nations in the 2024 revision of World Population Prospects.
From the beginning of the 21st century until July 2016, the Australian population aged 85 years and above has increased by 141.2%. [3] From 2016 to 2017, the Australian population aged over 85 increased from 484,600 to 494,300; that is a 9,700 increase within a one-year period. [3] [7]
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); by the late 18th century, estimates ranged close to one billion (consistent ...
Within 20 years, many countries in those regions will face a situation of the largest population cohort being those over 65 and the average age approaching 50. In 2100, according to research led by the University of Washington, 2.4 billion people will be over the age of 65, compared with 1.7 billion under the age of 20. [18]
Given 2020 demographic trends, it is projected that the U.S. population would grow slightly by 2100, while other countries, including China and India, would shrink. [3] By the end of the twenty-first century, the United States could comprise 4% of the global population, where it is now, and the median age could reach around 45, making the ...