Gerg,

how can I say this...be careful! Look through posts here and posts in Thaivisa.com - many,many nice poeple loose everything becaus of their Thai love.I am saying this as someone married to a Thai for over a decade, so it certainly can work. There is a basic golden rule here (in Thailand) that you will hear time and time again, "Only spend what you are willing to walk away from".
Yu can not legally own land here (Ok, there are some 'ways and means' that vary in their dubiousness, but officially - nope) so if she kicks you out after a week and you are not married (or bought the home before marriage) then she is going to keep it. There are quite good divorce laws here (even if poeple do not think there are) and prenuptuals can help too. Not wanting to look at the end before the beginningnhas got under way, but what I'm saying is be careful and protect yourself from day one. Do the research!!!

As to your marriage, I say "you only live once" - this life any way. Your choice, be a miserable, but safe old man or live out the rest in love, being cared for and the adventure of a new culture.

'nuff said my friend, good luck.