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“The elderly, normally the group most susceptible to influenza, not only survived attacks of the disease but were attacked far less often. This resistance of the elderly was a worldwide phenomenon. The most likely explanation is that an earlier pandemic , so mild as to not attract attention, resembled the 1918 virus closely enough that it provided protection. (p. 408 paperback edition)” — John M. Barry
The elderly, normally the group most susceptible to influenza, not only survived attacks of the disease but were attacked far less often. This resistance of the elderly was a worldwide phenomenon. The most likely explanation is that an earlier pandemic , so mild as to not attract attention, resembled the 1918 virus closely enough that it provided protection. (p. 408 paperback edition)