Good summary. I think the focus is on older people because of Covid vulnerability, and your doc does talk supplements for the elderly.
We do talk mostly elderly, but the early stats always said 80% of deaths are 65+, 20% are thus under 65. Likely concentrated 55+ but still, 20% of 900K is 180K who were not scheduled to die til 78ish.
A year ago when I started seeing reports of pediatric Covid cases with severe symptomology I said probably Vitamin D deficiency. This was based on studies I had read about the effect of D deficiency on blood platelets. Also, the observation that children in urban settings often don’t get outdoors as much as they should. Responsible parents may be afraid to let their children spend time in the streets, and be too busy working to supervise outside play. I was simewhat sickly as a child, and remember the doctor prescribed cod liver oil, a teaspoon a day. Also Argerol (silver solution) swabs placed in my nostrils for 1/2 hour while lying down for respiratory illnesses. My tonsils were removed when I was under 5, I had ear infections, measles,
chicken pox, and colds.
I read a report that the governor of Florida has appointed a Surgeon General who is advising zinc, Vitamin D3 and C, and Quercetin among other things. Will be interesting to see how Florida Covid statistics compare with other states in future Worldometers Covid-19 US reports. I wonder how this is being communicated to the public?