Yeah, bad choice of words on my part. I meant the apparent relatively mild symptoms in the young, and very small numbers of complications.
As O'n'G mentions, pre-existing conditions feature in the fatalities. I wonder what fraction of the population is free of those by 65 years of age. That cohort would have lots of ex-smokers too.
“Pre-existing” reminds me that there are tens of millions of uninsured low-income people in the US. I can imagine all too well how that could play out.