I would have thought your group would be made up mainly of people in the 50's and 60's who are basically done with their careers and are there mainly for the lifestyle. I know a few friends whose kids are teaching English in Korea and China and it is seen more as pocket money than a career.
Korea and China as well as here and Japan can be good money but ONLY if you are qualified. People that come over here with their BA in Sociology thinking that they are gonna fast track to the top are dead wrong. They will be paid the minimum that it takes for them to not quit and that's about it. The schools don't actually need these people and they are so easily replaceable because I don't think the lower level schools are actually held to any sort of academic standards. Therefore they just hire someone that "looks the part" and will actually discriminate against older people who are much more qualified.