Dr. Alan Copperman speaks to Healthline about new theory on why fertility declines with age

Every woman in her 30s knows she has a biological clock ticking. Everyone around her knows it too. For some women, this is no big deal. Either they’ve already had children or they have made the decision not to have them. But for women who still yearn to be mothers, that clock becomes louder and louder the further into their 30s they get.