In my daily practice as a fertility expert, I notice a strange paradox: women today are incredibly well-informed about nutrition, fitness, and skincare. Yet, when we sit down to talk about fertility, I’m met with a flood of questions—and often, the realization that much of the essential information has remained "under the radar."

A woman’s 40s are often the most mature, stable and creative decade of her life — professionally, personally and emotionally. But when the conversation turns to fertility...