I’m Almost 65. Have Walked 2 Miles Per Day For

I’m almost 65. Have walked 2 miles per day for over 25 years. Recently I’m experiencing some mild discomfort in chest area when walking. Symptoms go away at rest. No other symptoms. I’m pretty sure you’re going to say it’s heart related. I have always kept my weight down and eat a balanced diet. I did quit a 30 year one pack per day smoking habit over 5 years ago. Thanks.