The peak of ferility for a woman id around 20 years of age but fertilitu#y remains fairly steady uibntil around 30. After 30 it begins to decline steadily with quite sharp decrease after 35-37. After 40 fertility is only approximately 10% of what it was at 20. so if your chance at 20 was 90%, at 40 it is only 9%. this however is for individual women, and there are women who seem to buck the trend but nothing is guaranteed.
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