What is the minimum age requirement for citizens to vote for President?

The minimum age requirement for citizens to vote for President is eighteen years old. This age limit is established by the 26th Amendment to the United States Constitution, which was ratified in 1971. The amendment was enacted to ensure that citizens who are eighteen years and older have the right to participate in the electoral process, recognizing their maturity and capability to make informed decisions regarding their government.

In the context of the other age options presented, sixteen is too young as it does not align with the amendment, while twenty-one and twenty-five are significantly higher than the established minimum voting age, which was a change aimed at empowering younger voters following the societal shifts during the 1960s. Thus, eighteen remains the appropriate and legally recognized age for voting in federal elections, including the presidential election.