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 such as China, Turkey and Iran. This process is not restricted to Europe. In a number of European countries (Spain), the mean age of women at first childbirth has crossed the 30 year threshold. In Western, Northern, and Southern Europe, first-time mothers are on average 27 to 32 years old, up from 23 to 25 years at the start of the 1970s. The variability in definitions is in part explained by the effects of increasing age occurring as a continuum rather than as a threshold effect. ![]() For effects associated with father's age, see Paternal age effect.Īdvanced 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.
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