I'm on about 120K a month. That's for me and my western wife. We live in a great area, eat every meal out, and want for nothing.
So 60K is basically me without the wife, the big apartment, and the sushi and falafel habit.
Very def doable here in Chiang Mai. partic if you're willing to ride the little red bus 10 minutes further out.
The guy who lives next door to me lives on 40K. He has a local GF and keeps the a/c on low. An astonishingly plush life for $300 a week. His Doi Suthep view is the same as mine (for $300 a month less).