I promise I won't pass any news to the civil law section with respect to your grades.
The constitutional question I think comes down to dealing with the province on what their reaction would be to the age of marriage issue that is raised. For me, the issue is looking at the places in particular where marriage is permitted at the age of 15 to find out if there's a justifiable reason why the territorial governments allow marriage at age 15. Across the rest of the country in the provincial jurisdictions the marriage age is 16, with permission to marry younger in special circumstances. The key when you get to provincial regulation of marriage is to know that the provinces are doing it based on local conditions and that's why we allow them to have control over rules around solemnization. Marriage is a local, community, and social value, and may change across the country and in the northern communities and may have very different implications depending on where you live.
I take Mr. Moore's point that perhaps only a small fraction of marriages actually happen between teenagers, but on the books at least you have a conflict. For those teenagers it might be a very significant conflict and it might be a life-changing conflict. In particular, where you have an express age limit of 15 it bears questioning why, in those northern communities, for example, it's felt that this limit is relevant.