I think you'd be an auto-reject for the doctoral stream MA here at UofT, given that you already have two MAs in Economics. You may want to apply for the PhD. You need to submit your GRE scores, however, and as elcapitano mentioned, your Q score would probably be interpreted as 750ish.
There are a couple of older people in the PhD program here, but I don't know if their profiles had to be stunning to outweigh the age issue. Of the students starting this year, virtually everyone has an MA from a Canadian university. I'm not sure whether this is because of home bias or because they just received few (qualified) applications from elsewhere.
I would be worried mainly about your
LORs if your MA institution was only so-so. Also, the rigour of coursework tends to diverge quite substantially between good and not-so-good UK universities (at least at the undergraduate level, I'm not very familiar with the graduate level), which could mean that your qualifications might be discounted. Good-quality RA work will ease your case.
As has been mentioned already, your best bet is probably UK universities.