gerontocracy (n.)youdaoicibaDictYouDict[gerontocracy 词源字典]
"rule by old men," 1830, a Latinized compound of Greek stem of geron (genitive gerontos) "old man" (see gerontology) + kratia "rule" (see -cracy). Related: Gerontocratic.[gerontocracy etymology, gerontocracy origin, 英语词源]