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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.
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.