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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 likelihood of pregnancy depends mostly on maternal age rather than paternal age. There is no definitive age when men cannot reproduce because the number, or concentration, of sperm remains relatively constant for them.Even with decreases in semen volume, sperm motility and sperm morphology (the size and shape of sperm), men are able to produce sperm well into their senior years.he likelihood of pregnancy depends mostly on maternal age rather than paternal age. There is no definitive age when men cannot reproduce because the number, or concentration, of sperm remains relatively constant for them.