What chance do you think I have of obtaining a job teaching...

YOur experience and degree can out weight the age factor, howevere some countries do have age limits concerning their foreign workers. Taiwan, for example, has an age limit somewhere around 40, but again special exceptions are made routinely for people with a specific trade or experience. China, and South America are very open, and no age limitations.
Hope that helps,
Leo

Hello...I am in China and most schools cut off at 60 years old. I am 66 but there are opportunities if you look for them...

Thanks very much - have since had interest from recruiters in China (VIP China & BoAo international culture exchange company in China ) - thanks again - Arthur