A referendum on electoral suffrage was held in Puerto Rico on 1 November 1970.Dieter Nohlen (2005) Elections in the Americas: A data handbook, Volume I, p552 Voters were asked whether the voting age should be lowered from 21 to 18. The reform was approved by 59.2% of voters, with a turnout of just 34.7%.Nohlen, p556

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