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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.
Although research tends to focus on women, the study also found that male fertility starts declining at age 25 and most 40 year olds will need two years for their partner to conceive including if she is still in her 20s. If you would like to learn more about the best age to have a baby, you can watch the video below: