gerontocracy
noun
- form of olihgarchical rule where leaders are older than most of the population
Wiktionary
Pronunciation: /ˌdʒɛɹənˈtɒkɹəsi/
noun
Etymology: From geronto- + -cracy, from Ancient Greek.
- Government by elders; government by elderly rulers.
“Near-synonyms: senilocracy, graocracy (archaic)”
“It would come as no surprise to find that optimum science policy is apt to be developed neither by gerontocracy nor by juvenocracy but, like the community of scientists itself, by age-diversified meritocracy.”