Scientists warn that biological clock affects male fertility - The Guardian 7th July 2008

Wednesday, July 09, 2008

The biological clock ticks for men as well as women, doctors warn today, after research found that male fertility begins to decline when they reach their mid-30s. Doctors said men who wait until their 40s before starting a family face a greater chance of their partner having a miscarriage, because of the poorer quality of their sperm.

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