Gerontocracy is a term used to describe a political system that is dominated by the elderly. However, there are many other words that can be used to describe similar systems. One possible synonym for gerontocracy is "plutocracy," which refers to a government controlled by the wealthy. Another possible synonym is "timocracy," which refers to a government controlled by those with power and influence. "Oligarchy" is another term that can be used to describe a government controlled by a small group of people. Finally, "aristocracy" can be used to describe a government controlled by the aristocratic or upper class. These synonyms can help give a more accurate and nuanced description of political systems that are dominated by a particular group.