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Man have biological clock: male fertility declines in mid-30s


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Men - as well as women - have biological clocks that start to tick in their mid-30s.

The chance of successfully impregnating a woman falls if a man is over 35, a French study of over 12,200 couples having fertility treatment suggests. The chance of both natural and assisted conception is significantly lower if the man is over 40. According to researchers, the problems are linked to DNA damage in sperm.

The new study has shown that the risk of miscarriages does not only increase with the mother's but also the father's age. If the father is in his late 30s, miscarriages are more common than if the man is younger. If the man is over 40, the chances of a successful pregnancy are even lower.

According to Dr Alan Pacey, a fertility expert at Sheffield University and secretary of the British Fertility Society: "Previous studies of couples trying to conceive naturally or undergoing IVF have shown that men over the age of about 40 are less fertile than younger men. Moreover, if they do achieve a pregnancy their partners are more likely to miscarry. This study reinforces the message that men aren't excused from reproductive ageing."
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