Plus n (where n is a large number) on the cardiologist. I got an echocardiogram this spring which showed, totally asymptomatic, aortic stenosis. Untreated, it will damage the heart muscle and lead to a permanent slowing of the heart, to zero. Corrective surgery, a new valve, is scheduled for mid September. Without the scan, I could have gone along until I did irreversible damage. So go see the Doc.
On a more general topic, my good level of fitness makes me a better surgical candidate, so keep riding everybody.