Your story similar to mine. 73 years old, former runner and active person. Diagnosed a 18 months ago with “mild AFIB”. My first trip to Cardiologist triggered by PVCs discovered/happening during a half sleep leg vein procedure. Then came an Arteriorgram, CAC and 30 day Holter monitor. The result was 40% blockage and in D! Vein off the LAD artery at connection point and no stint till reaches 70% blockage. Of course over time I had every test insurance will allow since and placed on CPAP as well. Cardiologist put me on Apixiban blood thinner right away. From the beginning I started lifestyle changes, diet, exercise, no alcohol, no caffeine and mindfulness for anxiety. A recent Holter monitor indicated AFIB is less than 4% so they discontinued blood thinner. Said keep up the lifestyle changes and come back in 6 months.