Which constitutional amendment allowed voting by all qualified citizens aged 18 or older?

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The Twenty-Sixth Amendment was ratified in 1971 and lowered the voting age from 21 to 18, allowing all qualified citizens aged 18 or older to vote in federal, state, and local elections. The Fifteenth Amendment gave African American men the right to vote in 1870, while the Nineteenth Amendment gave women the right to vote in 1920. The Twentieth Amendment relates to presidential and congressional terms of office and inauguration dates.

Which Constitutional Amendment Allowed Voting by All Qualified Citizens Aged