At what age must citizens be to vote in presidential elections?

To participate in presidential elections, citizens must be at least eighteen years old. This age requirement is established by the 26th Amendment to the United States Constitution, which was ratified in 1971. The amendment was aimed at lowering the voting age from twenty-one to eighteen, reflecting the belief that those who are old enough to be drafted for military service should also have the right to vote. Therefore, eighteen is the legal age at which citizens can register to vote and participate in elections, including presidential elections. This crucial change in the voting age was a significant milestone in ensuring that younger citizens had a voice in the democratic process.