Heart rate is genetic - some people like me and my family have increased resting heart rate even while being athletic (one cousin was a table tennis champ and o

Heart rate is genetic - some people like me and my family have increased resting heart rate even while being athletic (one cousin was a table tennis champ and other highly competitive swimmer, both have increased resting rate). And our genes make us look young (20-30s) even in our 50s, as I can see on my relatives. So different genotypes have different characteristics I guess.