I agree it is harder to shift colds since covid but when you think of how long it takes children to build their immune system, I suppose it'll take ours time to get back to what it was.
The amount of sudden deaths I don't believe is covid related. I this sports have become far more strenuous on the body. Compare a professional athlete today to one 10 or 20 years ago.... And that has trickled down to amateur sports too! All these stats and monitors telling them they need to be pushing themselves harder, lifting heavier, running faster.... It can't be good for the body!