How old must citizens be to vote for President?

Citizens must be at least 18 years old to vote for President, which aligns with the requirements set forth by the 26th Amendment to the United States Constitution. This amendment was ratified in 1971 and specifically lowered the voting age from 21 to 18 years, reflecting the belief that younger citizens should be allowed to participate in the democratic process, especially during times of war and civil rights movements when younger individuals were actively involved in such issues. As a result, being 18 years old not only signifies reaching adulthood in many legal contexts but also grants individuals the right to engage in shaping their government by voting in national elections, including for the President.