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Effect of age on male fertility. While the effect of age on a man's fertility is not as significant as it is with women, there is a decline in the quality of sperm after the age of 45. After this age, it does tend to take longer for men to cause a pregnancy and the chance of having a baby with a health problem does slightly increase.
Fertility in women starts to decrease at age 32 years and becomes more rapid after age 37 years. Women become less. fertile as they age because they begin life with a fixed number of eggs in their ovaries. This number decreases as they grow. older. Eggs also are not as easily fertilized in older women as they are in younger women. Problems that can affect fertility, such as endometriosis and uterine fibroids, become more common with increasing age as well.