Aged patients (36–39 years) had a 5.3% higher risk ratio of having an AMH level < 0.7 ng/mL than younger age groups (P < .01), and the reduction in AMH accelerated at around 25, 35, and 40 years.[17,18] Another study showed that by the age of 32 years, over 50% of women had AMH levels categorized as “low fertility” (AMH ≤ 19.5 pmol/L), increasing to 75% by age 39, and a reduction in mean AMH of 1.72 pmol/L/year.[19] Although it is well established that female fertility declines with age, the rate and timing of this decline varies significantly among women. The gene discussed is AMH; the disease is female fertility.