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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.
Other causes of infertility or reduced fertility. Age - Both men and women are their most fertile in their early 20s. Female fertility declines sharply after the age of 35. Around one in three of couples in which the woman is over 35 have fertility problems.