Buddy,
I am sorry to hear about the heart attack, but glad you received timely medical attention which kept the damage to a minimum. Get well soon.
We 50+ riders always should keep in mind that heart disease continues to be the # 1 cause of death in the United States. Regular exercise like riding a bike helps, but we have to watch our diets, too. I make certain to get a yearly physical exam with my family physician, and I make certain I go over the results of my blood test (full lipid profile) line-by-line with my doc to make certain I am on the right track. I don't want to end up like one of my favorite cousins who died from a massive heart attack at the age of 52 a couple of years ago.