I believe it is entirely normal for a fit person who does significant amounts of cardio exercise to have a higher maximum, and lower resting, heart rate than the general population. I am 65, and my numbers are very similar to yours, Asterix. As a professional pilot, my heart has received fairly close monitoring over the last 45 years. During a bout of pneumonia in 1985, my sleeping heart rate was recorded as around 28-30 (which caused much consternation at the time), and I went through some very close monitoring after contracting viral pericarditis in 2015, including multiple Holter tests (24 hr recording), which confirmed that, while asleep, my HR was regularly well below 40.
One side effect of having been extremely fit for such a long time is that the heart, enlarged by decades of exercise, becomes flabby (like the rest of me!) when the exercise reduces. In my case, that resulted in an occasionally ectopic heart beat as the electronics start going a bit haywire. Again, that was very closely monitored every six months until I retired, during which time I learned that holding one's breath during an ECG stabilises things magically! My consultant cardiologist declared that, were I a regular patient, he would have been 'spectacularly uninterested' in the symptoms, but warned me that 'athlete's heart syndrome' is a real thing which applied to anyone who exercises long term (regardless of lack of talent) and can mean that one is more, not less, likely to experience a heart event as one relaxes into old age.
In other words, we are condemned to exercise until we drop! A mantra which I've steadfastly ignored during lockdown and need to adopt again...