Concept:Gerontocracy is a system of government led by the elderly.
Explanation:The term is formed from Greek words:
geron meaning "old man" and
kratos meaning "rule".
This means that in a gerontocracy, political power and decision-making authority belong to the oldest citizens.
Leadership is based on age and experience rather than on military force, wealth, or religious position.
It is not a military junta, not rule by one person, and not rule by priests or religious figures.
In practice, a council of elders or senior statesmen usually governs the state.
Their long experience and wisdom are seen as valuable for directing public affairs.
Therefore, among the given options, gerontocracy best matches governance by the aged.
Answer:D. the old