You searched for: “gerontocracy
gerontocracy (s) (noun), gerontocracies (pl)
A system of government in which senior citizens are chosen as rulers: A gerontocracy consists of a governing group of elders or older people; apparently because they are more experienced.
A member of a gerontocracy or an elderly citizen who has been elected to rule a country.
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Samuel is the ruling leader of his gerontocracy.