A citizen's voting age is determined solely by a government decision. It isn't really related to the concept of the age of majority or minority. No section of the Canada Elections Act states that only adults can vote. The voting age is simply set at 18. In this context, the age of minority or majority isn't defined, nor is the concept of a child or adult. It's just about the ability to vote.
On April 29th, 2024. See this statement in context.