Science
Old Ovaries, New Eggs: Can Adult Women Make New Oocytes?
For decades, biology textbooks have stated this as fact: “Women are born with all the eggs, or oocytes they will ever have.”1 The assumption — which shapes research on infertility and developmental biology, as well as women’s mindsets about their biological clocks — is that as women age, they use up those reserves they are born with. With each menstrual cycle, egg by egg, the stockpile wears down.