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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.
In men over 50, there is a decline in testosterone levels, which can impact sperm function, Robins said. As men get older, there is also a fall off in the number of healthy sperm and the movement of sperm. Older men can also have more DNA damage in their sperm. These changes could mean it takes longer for a couple to have a baby. As men get older, there is also a greater risk for genetic abnormalities in their sperm.