Not sure what the question is. If the doc clears you you're probably good to go. There are some rare things that pop up. For example I know a 19 year old who played soccer for probably 10+ years had her heart stop - it was a genetic thing - and now has a defibrillator/pacemaker implanted near her collarbone. It would have been fatal had she not been at work and some paramedics not been nearby. She's outwardly healthy, active, fit, etc, but it's a genetic thing.

On the other hand a long time ago I had a bunch of ECGs done and I finally asked (a new to me) doctor why they were testing me so much. It ends up I have an "inverse T wave" - something goes backward. My doctor explained that any person unfamiliar with my medical history would assume that I was having a heart problem and, if I wasn't conscious (for example), they'd keep me under observation for a bit. He recommended carrying a small version of my ECG in my wallet. He laughed and said that if I wanted a day off or two I could walk into an ER rubbing my chest and not say a word. With RoadID I also have a wristband with that info on it.

The thing is that I've had ultrasound, the ECGs (10?), two nuclear stress tests (radioactive dye injected, I run, get HR up, and they take pictures of my heart), I'm sure I've missed something, and no one explained why.

In the end it's been a non-event, at least so far (I'm 2 years younger than the OP). The first sign of this was about 15 or 16 years ago (when I went through two ultrasounds measuring my heart). I'd been racing 15+ seasons at that point, been racing every season since, and it's all good.

I have no idea what will happen when I'm 80 but I'll find out when I get there.

For the OP I think it's the same thing. If the doc clears you then go ride, knowing there are others out there like you. Good luck, hopefully it's something like that.