Before planning to retire in Thailand, a foreigner must be at least fifty (50) years old, a holder of a valid passport and able to meet the financial requirement. click the link below to read the whole article: http://rachelsiamlegal.livejournal.com/718.html

1. How to Apply for a Retirement Visa in Thailand
Non-immigrant “O-A” visa
The potential retiree who meets
the age requirement and
possesses a valid passport may
apply for an initial visa: the
Thailand Visa Nonimmigrant
Category “O-A.” Under this nonimmigrant visa, the foreign
retiree is allowed to stay in the
country for a period of one (1)
year. While in the Kingdom of
Thailand, however, he is
prohibited to perform any kind
of work.