Premature Ovarian Failure US
Puberty and Menstruation
By puberty, about 300,000 eggs normally remain in the ovaries. At menarche (the first menstrual period), one egg is released per month at ovulation. This is the beginning of fertility.
This monthly cycle continues until menopause. Throughout the years, the eggs continue to waste away at varying rates depending on the woman and her hormone levels and genetics.