"'When thinking about age, human biology predates any gender discrimination,' Sarah Norcross, Director of PET reminded the audience, who gathered last week in the ornate space of the Royal College of Physicians in Edinburgh. While women have a biological cut-off point for fertility – the menopause – no such point has been defined for men."
"For example, most of the public are unaware that it takes five times longer to achieve pregnancy when the father is over 45." - Quotes by Annabel Slater for BioNews
It is not necessarily the quantity of sperm that declines as a man ages, yet it is the quality of the sperm that declines.
Story via BioNews (bionews.org)