Answer: i am pretty sure its her age since the Twenty-sixth Amendment was about changing the voting age from 21 to 18
Explanation: The Twenty-sixth Amendment (Amendment XXVI) to the United States Constitution prohibits the states and the federal government from using age as a reason for denying the right to vote to citizens of the United States who are at least eighteen years old. It was proposed by Congress on March 23, 1971, and three-fourths of the states ratified it by July 1, 1971.