Which amendment lowered the voting age to 18 years?

The amendment that lowered the voting age to 18 years is the 26th Amendment. Ratified in July 1971, this amendment was significant because it addressed the disparity in voting rights, particularly in the context of the Vietnam War. Many young Americans were being drafted to fight in the war but did not have the right to vote on the policies and leaders that sent them to war. The 26th Amendment reflects the principle that if citizens are old enough to fight for their country, they should also have the right to participate in the democratic process by voting.

The other amendments mentioned deal with different issues. For instance, the 22nd Amendment limits the number of terms a President can serve, the 24th Amendment prohibits poll taxes in federal elections, and the 27th Amendment addresses congressional pay changes. These amendments, while important, do not pertain to the voting age, which is why they are not the correct answer in this context.