What is the male biological clock and how can men protect and boost their fertility?

We know a woman’s ability to conceive diminishes over time, but a growing body of evidence shows that a man’s fertility is also impacted by age

"People are often not aware that fertility issues affect males as well as females"

Paul, a 40-year-old married man from Dublin, fears he has left it too late to have children.

"I feel like Ireland has priced men like me out of fatherhood," he says. "We're college educated and want to be established in our careers by the time we have kids. We're usually in our mid to late 30s by then. When my dad was that age, he had three kids, a car and a house."