I have the same concerns, as I am a much older than what seems to be the average age for FT's. I am more interested in Europe than Asia, however, as a teaching destination. The age issue is definitely not restricted to that sector, as I found out after 35. Jobs were much harder to find here in the US. While I grin when people think my 22 year old son is my brother, (he hates that!) it hasn't helped me find what I really want in employment. I had one prospective employer say that he did not believe the birth date on my DL. I know he was joking, but barely - still, no help in job placement.

Now that he's grown and doing well on his own, I'm able to move about the planet. If I can't do it as a teacher, I'll be crushed.