"The Spanish flu had a greater impact on life expectancy than COVID-19 not only because more people died (both in absolute terms, and as a percentage of the pop.), but also because it killed many young people—who of course had more life-years left to live."https://quillette.com/2021/01/24/covid-19s-death-toll-a-historical-perspective/ …
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Not sure for that... It also may be that Flu immunity was already strong in older generation due to a earlier flu wave around 1880 with similar spike proteins but lower severity.
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