Harold Wilson's government changed the law in 1969, giving a new generation the chance to vote and allow youngsters to have their say on the government earlier in life.
As part of his general election campaign in 2015, Labour's Ed Miliband was an advocate of lowering the voting age and giving 16 and 17-year-olds the chance to vote.
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Since he lost that election, the Tories have refrained from promising the same changes, meaning millions of teens will have to wait until they're 18 to vote.
Five decades on, should the voting age be lowered again?