The Sperm Clock is Ticking

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It’s not just women who have to worry about their ticking reproductive clock.  Men’s sperm quality and quantity seems to deteriorate after the age of 35.  The proportion of sperm carrying an X chromosome also seems to increase, meaning older dads are more likely to have daughters.

As men get older their partners are at increased risk of miscarriage.

New scientist 27 july 2013

Terry Pfau DO, HMD