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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]
Under the law, the Immigration and Nationality Act of 1965, [39] the number of first-generation immigrants living in the United States has increased, [40] from 9.6 million in 1970 to about 38 million in 2007. [41] Around a million people legally immigrated to the United States per year in the 1990s, up from 250,000 per year in the 1950s. [42]
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, on the other hand, the proportion of over 65 is very high, the social systems of a country can be heavily burdened.
The United States also has one of the highest proportions of people who do marry by age 40; approximately 85% Americans are married at 40, compared to only 60% in Sweden. During the 1930s, the number of marriages and the marriage rate dropped steeply due to the Great Depression, but rebounded almost immediately after the Depression ended.
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An example of using age class structure to learn about a population is a regular bell curve for the population of 1-5 year-old fish with a very low population for the 3-year-olds. An age class structure with gaps in population size like the one described earlier implies a bad spawning year 3 years ago in that species. [7]
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.
The age structure of such a population is illustrated by using an example from the Third ... the United States necessarily experienced exponential population growth ...