Seriously though, if you like the creature comforts that you have now, it%26#039;s doubtful in the US. Unless you really want to put a lot of your own labor into growing/harvesting your own food, building your own house off of the land (sod, hand sawn lumber), and heating your house some how.... Not to mention transportation if you don%26#039;t have everything you need nearby...
But the real question is: can you retire WELL on $500/mth?
There are many places in the world you can live well on 500 dollars per month, if you are willing to give up most of the conveniences of North American living. Most people don%26#039;t live like us.
Actually you could do it in the U.S. too, by living on the street. So you need to specify all kinds of other details for a realistic answer, like what kind of house you would live in and what kind of food you would eat and what kind of medical care you would want and so on. If you don%26#039;t need much, living can be really cheap.