That doesn't mean there wasn't an error in this particular document. And given the coincidence in question, it warrants looking at the original source just to make sure. There should be no harm in validating your claim.

But, okay, it seems you want to avoid pointing us to the original table for some reason, so let's look elsewhere. The postsecondary participation rate was only 54% in 1999; the last of the gen-xers.

Your document from "Mr. Census" shows that millennials really only attend postsecondary schools during that window. If they aren't participating then, they aren't going to do so later. It is unlikely that gen-x is any different, right? I don't see that many 40 year olds attending class.

How does 54% participation amongst the population lead to ~70% (68% male, 74% female) completion? In 2004, only 68% of the students in Ontario graduated from high school, but even more of them are completing a postsecondary education without trouble? Only 55.4% of the working age population have a degree or diploma, but all of the working age generations are above 56% attainment, and the younger two significantly so?

I would like to believe your numbers, as I love nothing more than learning something new, but something just doesn't seem to add up here.