gerontocrat

noun

1. A member of a gerontocracy; an aged leader, especially one clinging on to power or ruling only by virtue of age.

   “In Poland, a so-called anti-Zionist urge proved that the Stalinist gerontocrats would stoop even to Hitlerite tactics to repress dissent and prolong their sterile and boring hold on power.”

   “India is run by gerontocrats and epigones: grey hairs and groomed heirs.”