Many websites will tell you you can live for USD 1000.00 or even 800.00 in Thailand and it is probably true. As long as you don’t choose Bangkok and the tourist areas to live, your money will go a long way.
You can find a one bedroom apartment outside the big cities for USD 226.00 or you can spend twice that much inside the city. The same goes for many other things. So just do your homework and decide what your necessities are and where you wish to spend the golden years of your life.