When it comes to fertility, the focus tends to fall on women and their (loudly ticking) biological clocks. Yet it’s not just women who have to take age into account when considering when to have children. Experts agree that men's fertility also depends on their age. According to Dr. Jane L. Frederick, a reproductive endocrinologist, women get most of the attention because they have a finite number of eggs at birth and must contend with changes in egg quantity and quality starting at age 35. “Women play an obvious role in reproduction, leading us to believe that the topics of...