How old must citizens be to vote for president?

Citizens must be eighteen years old to vote for president in the United States. This age requirement is established by the 26th Amendment to the U.S. Constitution, ratified in 1971, which lowered the voting age from twenty-one to eighteen. The amendment was largely influenced by arguments that if eighteen-year-olds were old enough to be drafted into military service during the Vietnam War, they should also have the right to participate in the electoral process. Therefore, only those who are at least eighteen years of age are eligible to vote in presidential elections, reflecting a commitment to youth representation in democracy.