gerontocracy
noun/ˌdʒerənˈtɒkrəsi/
/ˌdʒerənˈtɑːkrəsi/
(plural gerontocracies)
[countable, uncountable]- a state, society or group governed by old people; government by old peopleWord Originmid 19th cent.: from Greek gerōn, geront- ‘old man’ + -cracy.
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gerontocracy