Final answer:
Individuals between the ages of eighteen and twenty-one could vote in a presidential election for the first time in 1972 after the ratification of the Twenty-Sixth Amendment.
Step-by-step explanation:
The first time individuals between the ages of eighteen and twenty-one could vote in a presidential election was 1972 after the ratification of the Twenty-Sixth Amendment. Prior to that, most states required citizens to be twenty-one years old before they could vote in national elections.
The activism of college students in the 1960s, who argued that it was unfair to deny them the right to vote for the people who had the power to send them to war, led to the lowering of the voting age.