At this time, no federal legislation defines the age of minority or majority. The only age defined is the voting age, which is set at 18. However, that has nothing to do with the concept of majority.
Bill C‑63 on harmful content online is currently proposing that the age of majority be set at 18 in the digital world.
That said, right now only the provinces and territories, based on vital statistics, determine the age of majority and minority in Canada.