Allow me a short explanation of the difference between what many people call “retirement Non-O visa” and what they actually mean, the “1-year Extension of Stay based on Retirement”
If you plan to move permanently or retire in Thailand, or if your plan consists of hibernating regularly, I recommend that you first apply for a “single entry 90-days Non-Imm-O retirement/over 50 years old visa” via the E-visa system at the Royal Thai Embassy in your home country
The formal requirement for this visa category is that you are at least 50 years old. You do not necessarily have to be a pensioner to be able to receive this visa. Your wife and you each one needs to apply for their own Non-O visa, and each one of you needs to fulfill the requirements. Most embassies have stopped issuing "dependent" or "piggyback" visa for a a foreign wife. Your wife being 45 years old means that she cannot get a Non-Imm-O visa on her own. She will need a different solution.
The financial requirement is
EITHER
a monthly pension or income of a minimum of 65.000 THB or this sum equivalent in your home country currency. For the application to the initial visa, you can use official income or pension statements issued from authorities in your home country as proof
OR
Banked funds which equal a minimum of 800.000.- THB, or this sum equivalent in your home country currency. You can use your bank account at home to verify the funds, but you can also use a bank account in Thailand. For the application to the initial visa, the account can be on any bank worldwide, as long as you can prove it is in your name.
You will be issued a 90-days single entry Non-Imm-O visa, which will be good to use for 3 months for an entry into Thailand, from the date of issue.
You enter Thailand with this visa and will get stamped in for 90 days “admitted stay”
As soon as you have arrived in Thailand, you’ll need to open a bank account and deposit a minimum of 800.000.- THB.
In order to apply for your first one-year extension of stay, you will need the 800.000.- THB banked money proof, because if you are either a Brit, American or Australian citizen, your embassy doesn’t offer to issue an affidavit-of-income letter.
Your only option is to use the banked money method in the first year.
After one year, for your second application extension of stay, if you have collected 12 months of money transfers coming in from abroad into your Thai bank account, you can switch to the income method proof and don’t need any lump sum deposited in your Thai bank account any more.
For the application to the “1-year extension of stay” your Thai bank must issue a “12-months bank statement”. Make sure you ask your bank in time, as some banks need up to one week to produce this statement
For all future application to the yearly extension of stay permits, you just repeat this procedure.
When issued the extension stamp on Immigration, always buy a re-entry permit for the duration of the stay permit. The re-entry permit will keep your “extended stay permit” alive should you leave the country and re-enter before the extension expires.
A single re-entry permit costs 1000.- THB, and a multiple re-entry permit will cost 3800.- THB.
When you got a re-entry permit on your extension of stay permit, you can more or less come and go as you wish in the future as long as you’re back in time to apply for your next yearly extension of stay.
You will need to do a 90-days report while you are staying in Thailand. The 90 days report duty, however, will get suspended when you exit Thailand before the 90 days are up. When you re-enter Thailand, the 90-days clock restarts at day number 1
This I hope clarifies the difference in the wording “visa” and “stay permit”. Unfortunately, Thai Immigration doesn’t draw any difference. In their often uncomplete English, they call the extension of the stay permit a “visa extension”, regardless they don’t extend any visa