Dario - after reading your comments it seems you confuse what is posted as text narrative on a Thai Embassy website as to be a valid interpretation of Thai law and immigration police orders Re: retirement. Embassies and Consulates versus Thai Immigration are two different divisions of government and unfortunately what is sometimes posted on Thai Embassy website to be factually incorrect renderings of Thai Immigration police orders. Sad to say they are often just wrong
You have to make copies of every used page in your passport (make two sets even if not requested), original and copies of your home lease / rental agreement with copy of the landlords National ID and a copy of the Tambian Ban of the property, map to your house (Google map printout)...
Financial:
Cash in the Bank method - 800,000 Thai Baht in a Thai Bank aged for 60 days (first time applicant) with bank book updated day before submitting the application action (good to make a small deposit - then have the bank book updated), plus an official signed form Bank letter assuring that the bank account is really yours.
Or the Income Method. If you have any source or regular monthly income from outside Thailand... Then if it meets or exceed the equivalent 65,000 THB a month - you can used this as income proof. People from England can get a Embassy letter from the British Embassy attesting to this income. You have to show proof to your Embassy officer. With the Embassy letter of income verification you can just use this and no other proof of income to get the Non O Visa and later the one year Extension of Stay.
Just go to the Immigration office in Cha am area. Or down load the Visa Application form from the Embassy website that you choose to use (Vientiane, Savannakhet, Penang. Etc.) Download the Visa App Form and fill it out.
Dario my experience is different than yours. I find the mention of Retirement on web pages is outdated. The O-A used to list the word Retirement but that has been removed in many places. Retirement is not an official designation for a Visa status. But it matters little as the Non Immigrant O Visa with a one year extension amounts to the same thing. And - the same with the O-A visa
There is different opinions on this 'easier' issue - it depends on a person's whereabouts and situation. But Yes - certainly if you are in Thailand already
For the Non Immigrant O Visa goto a local immigration office in Thailand. Get a Visa application form and list of requirements. The Non Immigrant O Visa can be done in the Central office in Bkk or in places like Vientiane, Laos, or Penang, Malaysia and other nearby places