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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]
The days in which a woman is most fertile can be calculated based on the date of the last menstrual period and the length of a typical menstrual cycle. [4] The few days surrounding ovulation (from approximately days 10 to 18 of a 28-day cycle), constitute the most fertile phase.
Currently, female fertility normally peaks in young adulthood and diminishes after 35 with pregnancy occurring rarely after age 50. A female is most fertile within 24 hours of ovulation. Male fertility peaks usually in young adulthood and declines after age 40. [10]
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This is considered the end of the fertile phase of a woman's life. The predicted effect of age on female fertility in women trying to get pregnant, without using fertility drugs or in vitro fertilization: [38] At age 30 75% will conceive ending in a live birth within one year; 91% will conceive ending in a live birth within four years. At age 35
In their late 30s, most women have about 25,000 oocytes remaining. When the total egg count gets to around 1,000, the ovaries usually stop functioning normally, signaling the approach of menopause.
The ovulatory shift hypothesis proposes that women's behavior during the fertile phase should also reflect evolutionary adaptations for reproductive success. Fertile-phase women also spend more time on their appearance and tend to wear accessories like jewelry, makeup, or hairstyles that are perceived as trying to look more attractive.
The graded-signals hypothesis was first suggested by Nunn in 1999, [8] and suggests that exaggerated sexual swellings exist in female primates to indicate their fertile period to the males of the species. A larger swelling suggests that ovulation is more likely to occur, [71] thus indicating the phase when the female is most fertile.
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