On May 28th, 2018. See this statement in context.
May 28th, 2018 / 5:30 p.m.
Senior Policy Advisor, Privy Council Office
They could likely register at the polls and make a solemn declaration that they will be 18 on polling day. The definition of an elector is to be 18 on polling day, so they would be allowed to vote.
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