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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.
Approximately 20% of cases of infertility are due solely to male factor, and an additional 30-40% of cases involve both male and female factor. A manâs fertility can be affected by the following factors: 1  Endocrine (hormonal). 2  Chromosomal (genetic) disorders affecting sperm production and/or quality.ur goals in caring for infertile men include: 1  Identifying and treating reversible conditions. 2  Identifying irreversible causes in which assisted reproductive techniques using the male partnersâ sperm can be performed to achieve pregnancy.