In 2019 there were 2.4 million total deaths. I don’t think that 90% of those were old people. But even if it were, that would have been less than 2 million deaths of old people.
So if we have 2.7 million old people die, this year (2020), where did that extra 800,000 dead old people come from?
I presented the numbers shown on Wiki. I don’t know where your numbers came from. I would have expected the population number and the total deaths number to have grown some from 2003 to 2019; your figures indicate it didn’t. The 90% number is, according to Wiki, from the CIA Factbook.
I have not seen a current number for the US population other than the 360 million often presented by the media. Based on that estimate, which I believe is probably more correct than a lower official number because of our undocumented residents, and using the .83% rate we would expect 2,988,000 deaths in 2020 if it were a normal year. Using the 90% rate we would expect 2,689,000 of those deaths to be older people.
I presented these numbers so that we can put the expected deaths from the corona virus in perspective. Today it is reported that 150 people in the US have died from the virus. For calculation purposes let us assume that all these deaths occurred in one month. If we think that the number will double every month, then we could expect that over 12 months we could have about 320,000 deaths from the virus. Notice that this would be about 12 % of the total number of deaths of older people and about 10.7 % of all US deaths.
I doubt that we have any way to estimate how many of those dying from the virus would have died from something else or how many would not have died except for getting the virus. We will also probably never know how many of the virus related deaths would have occurred over the next few years but were “hurried” into 2020.
We may find that the attention we now pay to infectious diseases among older people will lead to better practices. Notice that current thinking is that doctors and other healthcare workers in Washington State entering multiple nursing facilities during normal working routines were the vectors for the virus.
While the sickness and deaths which have occurred and will occur are terrible, especially for the families of the victims, the numbers clearly show this is nowhere near the same level of the 1918 flu or any plague and should not give rise to the panic being promoted by the media.
A lady who has multiple degrees in public health, has worked in the field for at least three decades and has taught infection control at the national level has explained it to me like this: With no “herd immunity”, infectious diseases can be spread A to B to C. When B recovers and has immunity, A2 to B to C2 doesn’t happen. It is similar to putting control rods into a reactor, the transmission chain is broken and the reaction is stopped.
China is now reporting no new cases. This is after about a 6 or 7 month long struggle with the virus. If we extrapolate their experience to the US we might expect no new cases in July or August.