depends if children have a Thai or a foreigner passport

that's right, the requirement however will arise when you apply for the Extension of Stay based on retirement

If you choose the "monthly income method" this means that you must prove for a period of 12 months, that you have income of a minimum of 65,000 THB arriving on your thai bank account from outside of Thailand EVERY month - in this case it is irrelevant how you generate your income as long as you can prove it and it doesn't necessarily have to be a pension

it says "for persons OR pensioners" so clearly you are the "person" in this case who is NOT a pensioner, yet with enough savings to meet the financial requirement of a minimum of 800,000 THB on a thai bank account in your name, giving you the peace of mind - as it is the easiest procedure to follow. Or you can use the monthly income method (which is much more complicated to comply with)

it says: "1) For retirees aged 55 and over must submit the following documents:" . . . . maybe Austrians have to be older than retirees from the rest of the world 😅😅😅. . . .strangely, the same mistake appears in the german translation: "1) Pensionisten, welche über 55 Jahre alt sind, müssen die folgenden Dokumente vorlegen:" . . . in all other countries, for Non-Imm-O based on retirement the age limit is 50

. .and Tracy still has a valid multi-Re-entry permit . . .

alright! Many thanks, Tod !

I think he better checks if his re-entry stamp shows any signs of having gotten used or marked void . . .so he is aware that he might need a new re-entry permit for a next trip abroad and back

and the single re-entry is marked used & void . . . so why would Non- RE mean "re-entry still valid" ??

well if he entered using the re-entry permit, it would be void by now, and they would not stamp "Re" for an used re-entry permit. Could it not be an entry stamp showing he is entering on a Non-Imm based on RE-tirement, the extension being stamped separately anyways, and any re-entry permits (single or multiple) stamped separately as well . . . as is the case with all extensions of stay?