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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.
The decline in male fertility can affect the health of the children they may go on to have (Utting and Bewley 2011) . The chart below shows your chances of getting pregnant according to your age. The chart is only a guide. It shows average figures for women in the best of health (Khatamee and Rosenthal 2002) .ou know the most fertile years are in your 20s, but want to get a better idea of how age affects your fertility. You may find it encouraging knowing that the number of women over the age of 30 having babies has risen in recent decades (ONS 2010) . Yes.