Incorrect.

The relevant "definition" comes from the UN "Optional Protocol to the Convention on the Rights of the Child on the involvement of children in armed conflict".

This was signed and ratified by Canada in the year 2000.

Here's just one of the articles:
Article 4
1. Armed groups that are distinct from the armed forces of a State should not, under any circumstances, recruit or use in hostilities persons under the age of 18 years.

http://www.ohchr.org/EN/ProfessionalInterest/Pages/OPACCRC.aspx

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