Jakejas,
You are making your way out of College Station because your boys are in the SEC now, right?
But, to answer some of your concerns:
1. You are entering your prime. You have nothing to worry about, when it comes to your age. As a matter of fact, companies in Vietnam prefer younger enployees. The Vietnamese population is very young itself.
2. You don't have to teach English. You can work for various companies there; the manufacturing sector is growing in Vietnam. Look to see if you can latch onto one of the American companies or their subsidiaries in the area. You can also start your own company in Vietnam and sell your products or services to the many companies there... I think your chance at landing an employment contract or subcontract with, say GM or Ford, is much better than anyone else's.
3. I wasn't born with international business experience. I developed it, and you can do the same. Furthermore, if you can land a job with one of those global giants, whether it being an employee or a subcontractor, no one will demand international business experience from you. But, everyone will teach you a whole bunch.
Career path: Surfed the clouds and sailed the 7 seas as an Enlisted Aircrewman, with the US Navy. Got my BA, in Political Science, from the University of California. Spent a year studying International Law, at the University of Southern California. Took my family's garment manufacturing business and globalized it. Came to Vietnam because I was born there and could communicate fairly well. Started a clothes and cosmetics retail business, reclaimed my Vietnamese citizenship, and became worry-free.
A typical Vietnamese career path? Raised on a farm. Attended the Bo Tuc Van Hoa (Remedial Studies) University. Zoomed to the top, thanks to family ties to the Party. Drink like a fish and spend public money as if it is about to go out of circulation. Then, look for ways to immigrate to College Station, to avoid persecution.
I would say that the fore-mentioned paths are vastly different.
You can live with as many Vietnamese as you want, and for as long as you please, but if you don't speak the language, you will not be able to get at half of what I had just told you. 80% of the people in Vietnam don't speak any English. Then, if you don't speak Vietnamese, how are you going to communicate and establish trust. Vietnam is a place that does not have a criminal background check system, neither does it have a credit scoring system. Everything is still depended upon a person's network and the trustworthiness of such network.
Last but not least, when it comes to pay, you must take this into consideration: In Vietnam, compensations are still largely performance-based. Vietnamese, aside from their basic pays, get bonuses on holidays. Gee. Some even get bonuses on their birthdays or wedding days. Call it what you will. But that is how Vietnam is.