Correct Answer: Gerontocracy

Solution : The correct choice is the fourth option.

The term gerontocracy is derived from the Greek words "geron", meaning old man or elder, and "kratos", meaning power or rule. Therefore, a gerontocracy is a form of government where the political leadership is dominated by the elderly or older individuals.

The meanings of the other options are as follows:

• Autocracy is a system of government where one person has absolute power.
• Bureaucracy is a system of government in which decisions are made by state officials rather than elected representatives.
• Democracy is a system of government where power is vested in the hands of the people, either directly or through elected representatives.