Another interesting data point to me is that while I am in my late 50s, my two friends are in their 30s. All of us got sick. In fact, of the three of us, the one who had to go to an emergency room was in his 30s. He's doing better now, but still recovering.
All of us were caught by surprise at the intensity of our cases. Two of us don't even drink alcohol so there's some irony that we caught it in a bar. Or at least it appears we did. I imagine there is no way to really know if one or more of us had it prior to that night.