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Healthy women are fertile from puberty until menopause, although fertility is typically much reduced towards the extremes of this period. The onset of puberty is typically identified by menarche and the presence of secondary sexual characteristics such as breast development, the appearance of pubic hair and changes to body fat distribution.
DNA testing is rarely carried out to confirm claims of maternity at advanced ages, but in one large study, among 12,549 African and Middle Eastern immigrant mothers, confirmed by DNA testing, only two mothers were found to be older than fifty, the oldest mother being 52.1 years at conception (and the youngest mother 10.7 years old).
Reproduction is published on behalf of the Society for Reproduction and Fertility in the United Kingdom. Reproductive Biology and Endocrinology (RB&E) is an online open access journal published by BioMed Central. [7] It deals with both veterinary and human reproductive medicine.
Infertility is a common problem for women ages 15 to 49. In fact, the Center for Disease Control and Prevention says that about one in five (19%) are unable to conceive after one year of trying.
Meanwhile, fertility in England and Wales fell to its lowest recorded level between 2010-20 for women across all educational groups, according to a 2023 study from the University of Oxford.
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]
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