With respect to the voting age, no province or territory has experimented, that I'm aware of, with a voting age below 18. However, many political parties at both the provincial and federal levels have candidate selection, leadership selection, delegate selection to conventions, and any of a number of activities of political party membership available to some at 16 years and some at 14 years; I don't know if it goes lower than 14.
Having participated in a competitive nomination for a party with a voting age of 16, I'm wondering to what extent opening up the vote to a 16-year-old is an exercise in granting an extra vote to that child's parents.