What percentage of men have children by age 30?
Answer:
Starting in their 20s, men face steadily increasing chances of infertility, fathering an unsuccessful pregnancy, and passing on to their children a genetic mutation that causes dwarfism, according to the study.
The finding comes as more and more men are delaying fatherhood. Since 1980 U.S. birth rates have increased up to 40 percent for men aged 35 to 49 and decreased up to 20 percent for men under the age of 30, according to the research.
Studies have also shown that it takes longer for older men to conceive.
"We [now] know the probability for certain types of DNA damage goes up with age, and we can give you a mathematical probability," said Andrew Wyrobek, a researcher at the Lawrence Livermore National Laboratory in Livermore, California.
The higher the percentage of a man's sperm that has DNA damage, the less likely he will be able to successfully father a healthy child, Wyrobek added.
50%
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