there's been instances in the past of other athletes in that age range having heart troubles, Dave Cullinan had a heart attack and valve replacements done a couple years after winning the world champs more than a few years ago now…lots of young people don't think they could have heart problems so in a lot of cases they don't even know they might have issues.
Cully didn't have a heart attack, he suffered an aortic dissection, speculated to have been caused by a massive crash when his wheel fell off mid-jump. Certainly lucky to have lived.
Ride, don't slide.