How old do citizens have to be to vote for President?

To be eligible to vote for President of the United States, citizens must be at least eighteen years old. This age requirement is established under the 26th Amendment to the U.S. Constitution, ratified in 1971, which explicitly states that citizens who are eighteen years of age or older cannot be denied the right to vote based on age. This amendment was a pivotal change in American voting laws, as it lowered the voting age from twenty-one to eighteen, reflecting societal changes during the time, particularly regarding the rights of younger citizens who were being drafted for military service.

The other age options provided—sixteen, twenty-one, and twenty-five—do not align with the current constitutional requirements for voting in federal elections. Therefore, eighteen years old is the correct response, as it meets the criteria set forth in the Constitution for participation in presidential elections.