A lot of those same students would vote responsibly, if given the chance.

As a former high school teacher, I was very impressed with the political engagement of Gen Z. They are aware of issues and largely feel hopeless and ignored. If students could vote, schools would be an excellent place to teach students how to make an informed vote, and then take a field trip to voting centres to show them how easy it is to vote, too.

As it is, you're partly correct that 16 y.o.s largely don't pay close attention to party platforms, despite generally good awareness about local and global issues, but it's because it seems useless to them since they can't vote.

There's also research supporting that people who vote when they are first eligible to vote are likely to become lifelong voters, and those who don't will likely not. One of the biggest issues in Canadian politics is the demographic mismatch between voters, so "old people issues" are grossly over represented on party platforms—and fair enough that they are! They're the only ones who consistently vote.

Lowering the voting age to 16 would be a statistical artifact on most election results, in how few ridings would actually change hands, but the knock-on effect of building civic engagement for life would be an amazing change for Canadian politics. You would be surprised with how mature 16 year olds can be when it matters.