The Male Biological Clock – How to Tell the Time

For decades, we have recognized the age-related natural decline in female fecundity (the ability to reproduce) after the age of 30 (Maturitas 1988;[Suppl]1:15-22). Advanced maternal age (AMA) has also been demonstrated to increase miscarriage and pregnancies with chromosomal abnormalities, presumably from the increased rate of oocyte aneuploidy. There has been a sixfold increase in the rate of first birth in women aged 35-39 years (NCHS Data Brief 2014;152:1-8). Consequently, over the last decade, women, often before they reach AMA, have turned to elective oocyte cryopreservation for fertility preservation.

Ovarian Aging

Ovarian aging occurs through the decline in quality and quantity of oocytes. The former is a reflection of the woman's chronologic age. Markers of female ovarian aging have been utilized, for the past 3 decades, most commonly by basal follicle stimulating hormone. Currently, to assess the quantity of ovarian follicles, antimüllerian hormone (AMH) and transvaginal ultrasound for ovarian antral follicle count (AFC) are the most accurate indicators (J Clin Endocrinol Metab 2004:89:2977-81). While ovarian age testing, particularly AMH, has been widely used to assess a woman's “fertility potential,” it does not reflect her natural fecundity. In a prospective cohort study, AMH levels (ng/mL) divided into < 0.7, 0.7-8.4, and > 8.4, did not affect natural conception in women aged 30-44 who were divided into the categories of <35, 35-37, or 38-44 years (