I don't think there is any real answer to the Moisheh question (if there was a question). Other than camping in a Mayo Hospital parking lot. In other words - you have to be 15-20 minutes from a hospital. This would severely limit your choice of places for snowbirding or expat living, and the price point, or congestion, or other cons will make it meaningless for many of us.
"Traveling" to foreign 3rd world country is not the same as living there. Insurance companies know this well, there are zillions of plans for trips up to 30-60 days. For 6-12 months there is less, and at the age of 70-75 there is almost nothing, or it costs several thousand a year, or doesn't cover nothing.
Singapore and Thailand have good hospitals in big cities only, and the roads are poor. Dying at 75 while climbing the mountain is fine. Getting crippled for the rest of your life by not getting a TIMELY help with stroke, heart attack, food poisoning - is a different thing.
You pays yer money and you takes yer chance.