@Steve *****
You are incorrect :/ There is no requirement that BOTH foreigners who are married and over 50 have the 800K baht in the bank to get yearly extensions.
One foreigner meets the financial requirements and gets a Non-O visa based on being over 50 then a yearly extension based on the same thing and their spouse gets a Non-O visa based on being married to a foreigner on a long term extension AND a matching yearly extension for the same reason with NO proof of funds.