The salary is less of a problem if you're growing old there -- Montreal is a nice balance between the US and major European cities, where there is a pretty big social safety net. You don't need to pay for health insurance, childcare is much less expensive, college if you remain in the province as well, there is paid parental leave, that sort of thing. You do have to deal with winters and traffic which some people especially as they age get very frustrated with.

At this point in my life I would not consider again working in the US though. There's a certain amount of "life" I need in my "work/life balance" and I'm not sure I can get it in a country where it costs two months' salary just to deliver your kid.