The age on your birth certificate may say one thing, but the age of your heart is likely significantly older. A new report from the U.S. Centers for Disease Control and Prevention (CDC) released on Tuesday reveals that three out of four Americans have a predicted heart age that’s older than their real age, which means they are at a greater risk for heart issues like attacks and strokes. A person’s heart age is based on risk factors like blood pressure levels, whether they smoke and how much they weigh.