gerontocrat

noun1

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. — 2010