yoigu know how old you are, but do you know how old your heart is? there is a good chance the numbers don't match up according to a new study. you can figure out the number and even do something to fix it. have you heard of your heart age? it's a vital organ. according to a new report, three of four americans have a hea age that's older than their real agede. he $7art age is determi d by a mix of factors including blood pressure, weight, smoking and of course your actual age. for men between the ages of 30 and 74, their heart age is about eight years otcer than their charrono ggingl age. for women it's an average of five years older. the older your heart, the higher your risk of disease. once you calculate your heart age you can lower it by making important changes to your health. dr . natalie azar, "today" medical contributor, will help us make sense of this. good to see you. so we all gave you a bunch of information. gender, age, blood pressure, bmi, whether or not we smoke, diabetic, all those things that go into the formula. let's do a reveal. >>