I wanted to argue China is gerontocracy as well, but it seems I remember wrong

Jiang Zemin in office in office 1993-2003 - 67-77yo

Hu Jintao 2003-2013 - 61-71yo

Xi Jinping 2013-2026 - 60-72yo

about time to replace XJP

US really went downhill into gerontocracy after Obama

if it would be up to me I'd set limits to terms of candidacy to somewhere between 35-65 at the day of elections