Among men aged 15 to 44, more than three out of four (77 percent) are "presumed fertile," according to the National Survey of Family Growth. Here is the fertility status of men by age...
Aged 15 to 24: 94.3%
Aged 25 to 29: 87.8%
Aged 30 to 34: 73.9%
Aged 35 to 39: 60.8%
Aged 40 to 44: 48.1%
What accounts for the decline in the fertility of men by age? Mostly their own or their partner's surgical sterility. By their early forties, 40 percent of men (or their partners) are surgically sterile. A much smaller percentage of men are "subfertile" (meaning they would have difficulty fathering a child). The figure ranges from a low of 3 to 4 percent among men under age 30 to between 6 and 8 percent among men aged 30 to 44.
Source: National Center for Health Statistics, Infertility and Impaired Fecundity in the United States, 1982-2010: Data from the National Survey of Family Growth
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