Ovarian Aging and Fertility

Women in their late 30s to early 40s who have difficulty conceiving are often unaware that success rates of fertility treatment decline with age, most commonly due to declining ovarian function. Counseling about the high prevalence of infertility and miscarriage may be met with surprise and sadness. Reports of children born to high-profile women older than 50 years may contribute to misconceptions, but these births highlighted in the media were likely achieved with donor oocytes from a younger woman or with oocytes or embryos that were previously cryopreserved. Consistent with declining fertility rates worldwide,1 the fertility rate in the US has declined from 70.9 births per 1000 women in 1990 to 56.1 per 1000 in 2022.2 Simultaneously, the 2019 US Census reported that age at first birth had risen from 27 years in 1990 to 30 years in 2019 as more women postponed first birth.

Reasons for these trends may include lack of a partner, economic insecurity, career aspirations, and long work hours. Concerns about childbearing discrimination, including lack of pregnancy and postpartum support, and childcare challenges also likely influence decisions to delay pregnancy. Results of a questionnaire completed by 5692 US general surgery residents reported that more female than male residents delayed pregnancy because of training (46.8% vs 32.7%; P < .001) and experienced pregnancy/parenthood-based mistreatment (58.1% vs 30.5%; P < .001).3