It's very important that your docs listen well to you. My cardiologist is younger than I am but he pays attention to what I say and do. He's fine with my daily workouts at almost 60. I had a heart valve replaced about 5 years ago and they had to do some other cardio work. Also on blood thinners due to the artificial valve. You have to be confident and comfortable with those in charge of your health care. In reality, you are the one in charge. It's OK to shop around until you find the right connection. Good luck.