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At what age do oocytes become aneuploid?

Epidemiological studies have shown that aneuploidy, an abnormal number of chromosomes, affects a surprisingly high percentage of oocytes in young women, with rates significantly increasing after age 35. This age-related rise in oocyte aneuploidy is a major factor in fertility decline, miscarriage, and birth defects, making it a critical aspect of healthy aging to understand.