The ovarian reserve only decreases from birth, so it becomes less and less likely for a woman to conceive as they get older.
https://en.wikipedia.org/wiki/Age_and_female_fertility also notes: A review in 2012 came to the result that therapeutic interventions to halt or reverse the process of reproductive ageing in women is limited, despite recent reports of the potential existence of stem cells which may be used to restore the ovarian reserve
