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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.
Underweight men. Being underweight affects fertility even when it comes to men as they can have low sperm count. Just like in the case of women, where the menstruation is regulated by hormones, menâs testosterone level is at risk of being too small if the weight is not high enough.eing underweight affects fertility even when it comes to men as they can have low sperm count. Just like in the case of women, where the menstruation is regulated by hormones, menâs testosterone level is at risk of being too small if the weight is not high enough.