Yours is much better. That is the thing with models, they require simplification.

It would be interesting to relate your numbers to the total population in those age groups.

Apologies on the failure of the site to render charts. The columns were nicely split when I typed this in.

But in my model, I assumed that 100 million young, healthy Americans would be infected. Currently there are 17 million confirmed cases in the whole population. I think it is a reasonable assumption that without restrictions and social distancing or would spread quite a lot faster, no? (among the part of the population who are young and healthy)

And yes, it is interesting that the very young have fewer deaths. I have a 6 tu old daughter, she barely meets her grandparents. So not many ways to get infected.