Such a case is very unusual and I would question severely the use of "young and healthy" to describe such a person. Sorry if that seems harsh but naming is meaningful here.
So while there are relatively few Covid-19 patients and even fewer Covid-19 deaths, there are indeed a minuscule percentage of such cases. It's not worth worrying about for the average person.
Indeed that is the point: Covid-19 odds are so low that there is no reason for a normal intelligent person to be unduly concerned about catching Covid-19. Take precautions and go about your business. Truth is you're more likely to get killed in a car accident than by Covid-19.
The real problem may be characterised by the fact that half of the population has an IQ below 100. However as a society we've given up on eugenics, so that is a path not chosen!
In the US during 2018 there were ~36,000 auto fatalities. For the first half of 2020 Covid-19 is nearing 100,000 deaths with all the precautions. And there may be a surprising number of people with health complications of one kind or another (over 30% of US population is obese) that could be exacerbated by this virus.
> The real problem may be characterised by the fact that half of the population has an IQ below 100. However as a society we've given up on eugenics, so that is a path not chosen!
We are stronger when we work together. Suggesting that the government regulate procreation to increase society's IQ is ... not going to help toward that end.
If you're in those categories by all means, update your will and self-isolate. But otherwise you'll do fine. Even the healthy elderly, and there are plenty of them, do fine.