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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.
Theoretically you can have children at any age if you have sperm. But is that sperm going to give you the same genetic qualities as the sperm from a younger individual? We know that fertility does decline. We know that after the age of 30, there is a drop in testosterone of 1 percent a year. Testosterone is the energy, the hormone that you need to make good-quality sperm. It takes much longer for an older man to have children. But we havenât studied fertility of men in their 60s or older. Q: What does age do to sperm?