Heart disease is the No. 1 killer of women. Each year coronary disorders take the lives of a quarter-million women, far surpassing deaths from all cancers combined -- including breast cancer. You're never too young to start living heart-healthy, and never too old to find out how to do it. Start here with our quiz. But remember, even if you get a "low risk" result at the end of it, it's no substitute for a trip to your doctor with a list of questions about your own heart health.