You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did they change the voting age to 18?" whose answer is July 1, 1971.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when was the voting age changed to 18
Useful Output:

Doc 1: The 26th Amendment, which lowered the voting age to 18, has roots in WWII history.
Doc 2:  vote to all Americans aged 18 and older by lowering the federal voting age from 21. Section 1 of the 26th Amendment reads as follows: The
Doc 3: Ratified in July 1971, the 26th Amendment to the United States Constitution lowered the voting age of US citizens from 21 to 18 years old.
Doc 4: In 1868, Congress passed the 14th Amendment to the U.S. Constitution, giving men the right to vote at the age of 21. Women were added in 1920.
Doc 5: Amendment Twenty-six to the Constitution was ratified on July 1, 1971. It lowered the voting age for all Americans to eighteen years.