Those are the requirements listed in the Police Order
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that control extensions of stays based on different reasons.
For a foreign guy marrying a thai woman the requirements are 400K baht banked in a thai bank account in your name only for 2 months before you apply for the yearly extension OR a notary letter from your consulate stating you get 40K baht a month in income from abroad
For a yearly extension based on being over 50 (retirement) the requirements are 800K baht banked in a thai bank account in your name only for 60 days before your first yearly extension and for 3 months before every yearly extension after that OR a notary letter from your consulate stating you get 65k baht a month in income from abroad OR a combination of banked money (seasoned the requisite time) and the notarized income affidavit where the two total 800K baht for the whole year.