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

In the United States, citizens must be at least eighteen years old to vote in federal elections, including the presidential election. This requirement is established by the 26th Amendment to the U.S. Constitution, which was ratified in 1971. The amendment lowered the voting age from twenty-one to eighteen, reflecting a societal shift towards recognizing the rights of younger citizens, especially since many eighteen-year-olds were being drafted into military service during the Vietnam War.

This age requirement means that anyone who is eighteen years old or will turn eighteen on or before election day is eligible to register and vote. The other options presented do not align with this constitutional requirement, as they either set the age too low or too high in the context of federal voting laws.