The plural of gerontocracy; multiple governments or societies ruled by elderly people or in which the elderly hold most of the power.
From gerontocracy (Greek 'geron' + Greek 'kratia' meaning rule or power) + '-ies' plural. Describes political systems where age equals authority.
Modern democracies accidentally become gerontocracies as politicians gain seniority and voters age—the U.S. Senate shows this perfectly, with lifetime tenure keeping elderly people in power decades past typical retirement.
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