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Do ovarian follicles decrease with age, and what does it mean for fertility?

Women are born with all the eggs they will ever have, and the number of ovarian follicles is finite, a fact that directly relates to the question: do ovarian follicles decrease with age? By the time a woman reaches puberty, this number has already significantly dropped, and it continues to diminish throughout her reproductive lifespan, impacting fertility and leading eventually to menopause.