Well you are certainly on the upper end of the age limit. However, there are plenty of opportunities in Canada. You can maybe start as a flight instructor or small flying jobs like banner towing, skydive pilot, survey pilot etc. Once you have experience you can try the small regional airlines. So having a Canadian citizenship is very useful. Good luck and age shouldn't be a problem as much. I know of people who started their career in aviation at about the same age as yourself. They're now airline pilots.