As adjectives the difference between gerontocratic and geriatric
is that gerontocratic is of or relating to gerontocracy while geriatric is of or pertaining to the elderly.
As a noun geriatric is
(slang) an old person.
geriatric
English
Adjective
(
en adjective)
Of or pertaining to the elderly.
Of or pertaining to geriatrics.
Noun
(
en noun)
(slang) An old person.