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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 decreases with a woman's age. This is because every woman has millions of eggs or, more specifically, follicles that mature into eggs inside her body when she is born. By the time she reaches puberty, though, the number of these follicles drops down to about 300,000 to 400,000.