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In WWI ten million soldiers died. That means most of the men in the 18-25 demographic were wiped out or made cripples. What then happened to the 10 million surplus women who would never find mates? Life for an unmarried/widowed woman in her mid twenties must have been especially difficult as she would have to compete with girls born after 1900 for marriage.
Strangely I don't seem to recall anything made of this in the history books.