Atresia is a new word for me: the rate at which egg quantity declines through a woman's reproductive lifetime.
6-7 million oocytes existing prior to birth to 1,000 eggs or so in the final years before menopause.
"By the time you have your first period, you will only have around 300,000 to 500,000 oocytes in your ovarian reserve. Of that number, around 300 to 500 will reach maturity over the course of your lifetime. Menstruating people lose around 1,000 additional eggs each month. These immature eggs remain encased in their follicles and die off to be absorbed naturally back into the body."
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