141 000 Quebecois have Alzheimer or any other kind of neuro-degenerative disease, for 8.4 millions of people in Quebec.

Ontario has 14.57 millions inhabitants and about 250 000 people living with dementia.

That's 1.7% in Quebec vs 1.7% in Ontario. Bilinguism does not seem to protect people much outside of Barcelona.

EDIT: British Columbia has apparently somewhere around 70 000 people living with dementia for a population of 5.07 millions, which is about 1.4%.