AMH and Infertility: While examining cross sectional changes in early follicular (days 3-5) AMH levels among 238 infertile women, Tremellen et al. [21] found that AMH levels remained relatively stable from 18 to 29 years of age, followed by a 50% decline in AMH levels between 29-37 years of age (decline to 1 ng/mL by age 37).