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A study of a population of French women from 1670 and 1789 shows that those who married at age 20–24 had 7.0 children on average and 3.7% remained childless. Women who married at age 25–29 years had a mean of 5.7 children and 5.0% remained childless. Women who married at 30–34 years had a mean of 4.0 children and 8.2% remained childless. [20]
In 2017, Guttmacher reported that almost 25% of women will have had an abortion by age 45, with 4.6% of 20-year-olds and 19% of 30-year-olds having had at least one. [14] More than six million women in the United States, or 11 percent of women of reproductive age, become pregnant each year.
Replacement fertility is the total fertility rate at which women give birth to enough babies to sustain population levels, assuming that mortality rates remain constant and net migration is zero. [8] If replacement level fertility is sustained over a sufficiently long period, each generation will exactly replace itself. [ 8 ]
Country Rate per . 1,000 women per year Number of abortions per year Year Age range Greenland 84.7 870 2022 [7] [8]: 17–64 Vietnam 64.0 1,630,000 2019 [9]: 15–49 Madagascar
Each year, complications from pregnancy and childbirth result in about 500,000 birthing deaths, seven million women have serious long-term problems, and 50 million women giving birth have negative health outcomes following delivery, most of which occur in the developing world. [5]
Under federal law, the Immigration and Nationality Act of 1965, [41] the number of first-generation immigrants living in the United States has increased, [42] from 9.6 million in 1970 to about 38 million in 2007. [43] Around a million people legally immigrated to the United States per year in the 1990s, up from 250,000 per year in the 1950s. [44]
The mean age at childbearing indicates the age of a woman at their childbearing events, if women were subject throughout their lives to the age-specific fertility rates observed in that given year. [1] In countries with very high fertility rates women can have their first child at a much younger age than the mean age at childbearing.
In the US, the average age at which women bore their first child advanced from 21.4 years old in 1970 [11] to 26.9 in 2018. [4]The German Federal Institute for Population Research stated in 2015 the percentage for women with an age of at least 35 giving birth to a child was 25.9%.