noun
a society, state, or group governed by the elderly
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The country's government had transitioned into a gerontocracy, with most of the leaders being elderly individuals.
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It seems like we're living in a gerontocracy now, with all these old politicians running the show.
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I can't stand this gerontocracy, it's time for some fresh blood in charge.
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The company's boardroom felt like a gerontocracy, with the same old ideas being recycled over and over again.