There is a gradual decline in female fertility as women age. as an example, for women a single act of intercourse is only half as likely to produce a pregnancy as it would for a woman 19 to 26 years old.

For women 40-45, a single act of intercourse is only half as likely to produce a pregnancy as it would for a woman 19 to 26 years old.

This happens because oocyte (egg) supply decreases significantly with ages. Also, older eggs are more likely to have chromosomal aberrations, raising the risk of miscarriage and birth defects.

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