The questions posed by BajaGringo are definitely worth answering. Please do more research and think about the answers from your personal perspective.

I'm living in a semi-tourist area and working for a local resort a couple of hours a day (teaching English). I can survive quite nicely on my pension of about $900 CDN per month, since I am given my big meal of each day at the resort, but I love having the extra income so I can go out for a cheap meal once a week just to socialize with friends.

Never discount the culture shock you will no doubt have about 3 months after you arrive. Most gringos insist that it will not affect them, but it surely does. Be prepared to be looking for gringo friends at this stage ... you will need their encouragement and assurances. In other words, my advice is to avoid burying yourself in a Mexican enclave where things that are familiar to you are unavailable. You will become very frustrated and, possibly, depressed if you cut yourself off entirely from the familiar.

C'mon down and enjoy your adventure!