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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.
You also have age on your side -- the average woman's fertility peaks at the age of 24. Women under age 25 have a 96 percent chance of conceiving in a year if they're trying each month. If the guy is under 25, the odds drop to 92 percent. That's because many fertility issues among younger couples are on the man's side.