gerontocracy

As nouns the difference between gerontocracy and geriatric

is that gerontocracy is government by elders while geriatric is (slang) an old person.

As an adjective geriatric is

of or pertaining to the elderly.

As nouns the difference between oligarchy and gerontocracy

is that oligarchy is a government run by only a few, often the wealthy while gerontocracy is government by elders.

As nouns the difference between hedonism and gerontocracy

is that hedonism is (ethics) the belief that pleasure or happiness is the highest good in life some hedonists, such as the epicureans, have insisted that pleasure of the entire mind, not just pleasure of the senses, is the highest good while gerontocracy is government by elders.

As nouns the difference between gerontocracy and psychosis

is that gerontocracy is government by elders while psychosis is (label) a severe mental disorder, sometimes with physical damage to the brain, marked by a deranged personality and a distorted view of reality.

As nouns the difference between gerontocracy and theocracy

is that gerontocracy is government by elders while theocracy is government under the control of a state-sponsored religion.