I am not a doctor so please don’t take this as medical advice.
I was in the same position, post Covid. I’m just shy of 40. I felt fine 8 days after onset of symptoms, but following some stories of bad experiences on here, decided to be cautious and get medical advice.
I had some bloodwork done; FBC, troponin, D-dimers, as well as an ecg. I had to go private for this (I’m in the UK, and my NHS GP described the request as ‘unnecessary’).
Everything came back normal/as expected (white blood cell types consistent with recent mild infection) so the doc (who was a cyclist, interestingly) cleared me to return to training, with the caveat that I was to listen to my body, save the ‘hero’ stuff for 2 weeks, and to call him if I had any unexpected symptoms following, or reactions to, training.
4 rides/sessions in, the last 2 fairly hard, and so far so good.
I can’t speak for anyone else but that’s my take on it.