At what age must citizens be to vote for President?

Citizens must be at least eighteen years old to vote for President, which aligns with the requirements established by the 26th Amendment to the United States Constitution. Ratified in 1971, this amendment was a significant change that lowered 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 participate in the electoral process. This aligns with the democratic principle that all citizens should have a voice in their government as soon as they reach a certain level of maturity and civic responsibility.