covid死亡率by age： 55岁以下占比8%。考虑excess死亡55岁以下死亡率可能更高。

1。 不考虑excess死亡

https://www.heritage.org/data-visualizations/public-health/covid-19-deaths-by-age/

According to data from the Centers for Disease Control and Prevention, COVID-19 is deadliest among older populations. In fact, through December 2, 92 percent of COVID-19 deaths nationwide have occurred among those ages 55 or older. Only 0.2 percent were younger than 25. This trend can also be found on the state level.

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2. 考虑excess死亡

https://www.cdc.gov/mmwr/volumes/69/wr/mm6942e2.htm

The total number of excess deaths (deaths above average levels) from January 26 through October 3 ranged from a low of approximately 841 in the youngest age group (<25 years) to a high of 94,646 among adults aged 75–84 years.§§ However, the average percentage change in deaths over this period compared with previous years was largest for adults aged 25–44 years (26.5%) (Figure 2). Overall, numbers of deaths among persons aged <25 years were 2.0% below average,¶¶ and among adults aged 45–64, 65–74 years, 75–84, and ≥85 years were 14.4%, 24.1%, 21.5%, and 14.7% above average, respectively.