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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.
English: Mean age of mother by birth order in England and Wales, detailing the mean ages of mothers at the first, second, third and fourth birth (if they have that many children) Date 12 September 2022
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 claimed in 2015 the percentage for women with an age of at least 35 giving birth to a child was 25.9%.
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
A woman may be considered a mother by virtue of having given birth, ... the average age at first birth was 25.6 and 40.7% of births were to unmarried women ...
The reduction of the total fertility rate of the United Kingdom has also had an effect on the mean age in which a mother gives birth to her first child. [49] The age in which a mother gives birth to her first child has changed depending on the time period, but since the 1970s the age in which someone gives birth has been trending upwards. [49]
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.
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