高齢者 要注意

That is for US and possibly UK. Rest of Europe 91% are over 65 years of age. See https://t.co/JfrE2t3eAP and tables below. This makes deaths per case super-sensitive to age distribution. Reporting cases without age range meaningless; still a great way to keep on terrorizing us. https://t.co/28ZQHZwFCd pic.twitter.com/HKonn0htmC

— Michael Levitt (@MLevitt_NP2013) July 23, 2020

コロナ原因死、米（英）では８０％以上が６５歳以上、欧州では、９１％以上が６５歳以上
Coronavirus: COVID Deaths In U.S. By Age, Race

Of course, IFR varies depending on age. Young people are far less likely to die than older people. The Swiss study estimated IFR's by age group

Infection fatality rate

Infection fatality rate
The term infection fatality rate (IFR) also applies to infectious disease outbreaks, and represents the proportion of deaths among all the infected individuals. It is closely related to the CFR, but attempts to additionally account for all asymptomatic and undiagnosed infections.[7] The IFR differs from the CFR in that it aims to estimate the fatality rate in all those with infection: the detected disease (cases) and those with an undetected disease (asymptomatic and not tested group).[8] (Individuals who are infected, but always remain asymptomatic, are said to have "inapparent" — or silent, or subclinical — infections.)
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Case fatality rate of COVID-19 by age

For COVID-19 cases the opposite seems to be true. The elderly are at the greatest risk of dying, if infected with this virus.

It may not simply be that the older you get, the more at risk you are, though. As we show in the next section, the CFR for people with underlying health conditions – such as cardiovascular diseases, respiratory diseases or diabetes – is higher than for those without. Elderly people are more likely to have those conditions, which is likely to be part of the reason why the elderly are most at risk from COVID-19.

COVID-19 has had measured CFR's ranging from 1% in Iceland through 4.6% in the U.S. and 5% in China, to 14% in Italy and the UK. The World Health Organisation has estimated the IFR at 0.6%. [11]

いずれにせよ、初期のころから言われていたことだが、高齢者、病気持ちが要注意、ということだね。