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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.
And many factors can affect your chances of conceiving: Your age â the older you and your partner are, the longer it will usually take to get pregnant. This is due to fertility starting to decline around age 30 and dropping more after age 35. Male fertility will also drop but over a more gradual timeframe.