What group had the highest risk of mortality from the flu pandemic that killed upwards of 40 million people worldwide?

Question

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The 1918 flu pandemic, often referred to as the Spanish Flu, had an unusual mortality pattern, with a high death rate among healthy adults aged 20 to 40, in addition to the typically high mortality rates among the very young and very old seen in most influenza outbreaks. This made it distinct from other influenza viruses, which usually pose the greatest threat to the very young, the elderly, and those with weakened immune systems.

What Group Had the Highest Risk of Mortality from the Flu