I am one of those baby-boomers who “forgot to have children” until my early forties. Once we began trying, I was amazed, then distraught, when pregnancy didn’t happen as it had, unplanned, when I was thirty, the very first time the birth control barrier was down. Susan Sarandon, exactly my age, was radiantly pregnant; in fact, it seemed that every movie star of my generation was. People magazine was celebrating: “It’s never too late!” So I was startled when my doctor sternly put a damper on my enthusiasm. “It’s going to be an uphill battle,” he warned, writing out a prescription I was sure I didn’t need.