Even if you could isolate people by age, you’re going to put 20% of the under 40 crowd in the hospital, which will overwhelm the system.
And if 20% end up in the hospital, then I bet at least another 20% are out of work 2 to 3 weeks with this illness. Maybe 60% can fight it off with no symptoms or miss less than 1 week of work.
I think the solution is that everyone wears masks. Preferably googles too. Everyone, whether healthy or sick.
Social distance until you get the spread rate low in the community, and then everyone wears masks until it’s completely eliminated from the community. Community/State isolation until the communities around you have low spread rates.
no ICU admissions or deaths were reported among persons aged ≤19 years. Similar to reports from other countries, this finding suggests that the risk for serious disease and death from COVID-19 is higher in older age groups.
You are NOT going to put 20% of anybody in the hospital. Think.