James Shirley if you are over 50 and have the funds then apply for the Non O 3 month retirement visa - you dont need to be married to do this. You can then open the bank account, do the seasoning and either apply for the extension by reason of retirement or after you get married by reason of marriage to a Thai national. Although the by reason of marriage means you only have to keep 400,000 instead of 800,000 in your bank account (or transfer
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in every month for a year) to gain the extension, some people just keep the by reason of retirement because the by reason of marriage requires more proofs and paperwork.