Which amendment prohibits denying the vote on the basis of age?

Prepare for your Honors Voting and Elections Exam. Study with practice questions and detailed explanations. Ace your test!

The main idea is protecting voting rights from age-based exclusion. The amendment that prohibits denying the vote based on age states that citizens who are 18 years of age or older shall not have their right to vote denied or abridged by the United States or by any State on account of age. This explicitly sets a federal safeguard: once you’re 18, your vote cannot be blocked for being younger.

Context helps: before this change, many states kept the voting age at 21, while 18-year-olds could be drafted for military service. The movement to allow 18-year-olds to vote gained momentum during that era, and the amendment was ratified in 1971 to align voting eligibility with the age of adulthood.

The other amendments address different issues—one prohibits denying the vote based on sex, another bans poll taxes, and another repeals Prohibition. The one that specifically targets age demonstrates why 18-year-olds must be eligible to vote, making it the correct choice.