Welcome to the club! I had mine 18 months ago at age 61 while on a ride although didn't know it at the time. I just ran out of gas and didn't "feel right" when I got home. My wife drove me to the ER and after a quick test or two, the cardiologist told me I had one. A stent was installed and cleared the 99% blockage. Since then, I've put over 2k on my MTB and 5.4k on my road bike. I watch my diet and weight and take my meds. Things could have been much worse and I am glad to be here. Listen to your doctors and your body. I'm impressed with your mountain ride. Go finish when you can.