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  2. List of countries by age structure - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_age...

    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. The age structure of a country has a strong impact on society and the economy. If the proportion of 0–14-year-olds is very high, there may be a so-called youth bulge. If ...

  3. List of countries by median age - Wikipedia

    en.wikipedia.org/.../List_of_countries_by_median_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 countries, Canada, Cuba, Hong Kong, Japan, South Korea, Taiwan, and Thailand.

  4. Demographics of the United States - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_the_United...

    The median age of the total population as of 2021 is 38.8 years; the male median age is 37.7 years; the female median age is 39.8 years. [52] Median age of the U.S. population through history. Source: U.S. Department of Commerce. Bureau of Census, United States Census Bureau and The World Factbook. [63] [64]

  5. Demographics of the world - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_the_world

    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. [7] The world population more than tripled during the 20th century from about 1.65 billion in 1900 to 5.97 billion in 1999.

  6. Demographic history of the United States - Wikipedia

    en.wikipedia.org/wiki/Demographic_history_of_the...

    The average age at first marriage for both men and women began to fall after WWII, dropping 22.8 for men and 20.3 for women in 1950 and dropping even more to 22.5 and 20.1 years in 1956. In 1959, the United States Census Bureau estimated that 47% of all brides marrying for their first time were teenagers aged 19 and under.

  7. Population pyramid - Wikipedia

    en.wikipedia.org/wiki/Population_pyramid

    Population distribution by age and sex for Angola in 2005. A population pyramid (age structure diagram) or "age-sex pyramid" is a graphical illustration of the distribution of a population (typically that of a country or region of the world) by age groups and sex; it typically takes the shape of a pyramid when the population is growing. [1]

  8. List of U.S. states and territories by median age - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._states_and...

    This is a list of U.S. states, the District of Columbia and territories by median age in 2020. [note 1] 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.

  9. Demography - Wikipedia

    en.wikipedia.org/wiki/Demography

    The Demography of the World Population from 1950 to 2100. Data source: United Nations — World Population Prospects 2017. Demography (from Ancient Greek δῆμος (dêmos) 'people, society' and -γραφία (-graphía) 'writing, drawing, description') [1] is the statistical study of human populations: their size, composition (e.g., ethnic group, age), and how they change through the ...