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.