It was established in time for the presidential election of 1972. It took an amendment to the Constitution, but further research will be required to determine which amendment that was.
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The right of an eighteen year old to vote in all elections was firmly established by the Twenty-sixth Amendment. It was ratified in 1971.
Griswold v. Connecticut
The 19th Amendment.
They were campaigning for women's suffrage (hence the name) - suffrage is the right to vote in elections.
the 19th amendment (~^_^~)
42 years