Advanced maternal age, in a broad sense, is the instance of a woman being of an older age at a stage of reproduction, although there are various definitions of specific age and stage of reproduction. The variability in definitions regarding age is in part explained by the effects of increasing age occurring as a continuum rather than as a threshold effect. The most commonly used definition of advanced maternal age is 35 years or more at the time of childbirth.
In Western, Northern, and Southern Europe, first-time mothers are on average 26 to 29 years old, up from 23 to 25 years at the start of the 1970s. In a number of European countries (Spain), the mean age of women at first childbirth has now even crossed the 30 year threshold.
This process is not restricted to Europe. Asia, Japan and the United States are all seeing average age at first birth on the rise, and increasingly the process is spreading to countries in the developing world like China, Turkey and Iran. In the U.S., the average age of first childbirth was 25.4 in 2010.
Read more about Advanced Maternal Age: History, Changes in Interpregnancy Interval
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