It affected younger people more: https://en.wikipedia.org/wiki/Spanish_flu#Patterns_of_fatality https://en.wikipedia.org/wiki/Spanish_flu#Patterns_of_fatali...

It affected younger people more: https://en.wikipedia.org/wiki/Spanish_flu#Patterns_of_fatality https://en.wikipedia.org/wiki/Spanish_flu#Patterns_of_fatali... > The pandemic mostly killed young adults. In 1918–1919, 99% of pandemic influenza deaths in the U.S. occurred in people under 65, and nearly half of deaths were in young adults 20 to 40 years old.