A referendum on lowering the voting age from 21 to 18 was held in Denmark on 24 June 1969.Dieter Nohlen & Philip Stöver (2010) Elections in Europe: A data handbook, p524 The proposed change was rejected by 78.6% of voters with a turnout of 63.6%.Nohlen & Stöver, p533 Two years later, the electoral age was instead lowered to 20 years, and finally, after a 1978 referendum, to 18 years.
Results ChoiceVotes%For448,72621.4Against1,646,68578.6Invalid/blank votes8,443–Total2,103,854100Registered voters/turnout3,309,55163.6Source: Nohlen & Stöver
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