Note that 70+ years has an IFR of 5.4%. https://www.census.gov/prod/cen2010/briefs/c2010br-09.pdf says that in 2010 there were 308,745,538 Americans, 40,267,984 of which were over 65 and 12,435,263 in the 65-70 age bracket. That makes 70+ around 9% of the population, which means that expected deaths from people who are 70+ are an IFR for the general population of 0.49%.

That's the bulk of the deaths. Add in the other age groups and, if you do the numbers correctly, you should get close to my figure. (With a small difference because you're quoting updated numbers and I'm quoting figures that are a few months old.)

That's a ratio. 0.054 = 5.4%, etc.

From your link:

> The parameters in the scenarios:

> Are estimates intended to support public health preparedness and planning.

> Are not predictions of the expected effects of COVID-19.