Can I apply for a dependency visa in Thailand if my wife gets a retirement visa?

Yes you can

Always weigh up those who tell you to avoid AO retirement visa because it requires health insurance. If you're planning retirement in Thailand, unless you're a big fan of begging for money on GoFundMe, at some time you're going to need to attend doctors, specialists and hospitals. Sadly it's one of those drawbacks of getting old. Now if you're quite wealthy and are happy to fund your own health requirements, that's excellent, because Thai hospitals, although offering world-class facilities and services, are NOT cheap. If you start with an insurer before you turn 75, you can keep renewing until you're 99.

If using this route try to get your marriage certificate legalused for use in Thailand before you come as it will save you time & hassle. Google has several articles on this

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Your wife is eligible to apply retirement visa in Thailand and you can obtain the dependent visa after her get retirement visa.

Anyhow you and your wife have to obtain Non Immigrant visa category "O" before enter Thailand . Kindly note it should be Non "O" not Non O-A because of Non O-A it requires more insurance cover for 400,000 B for first obtaining and renewal visa.

Non O is only required 800K (the principle account or provable pension for 65,000 B per month)in bank account.

Financial evidence such as a copy of a bank statement with an amount equivalent to Thai currency of not less than 800,000 baht or a certificate of income/pension (original) of not less than 65,000 baht per month, or having a deposit account and income. /pension (per month X 12) total not less than 800,000 baht (in case of showing a copy of the deposit account The original bank certificate must also be presented when you obtain visa at Thai enbassy) (( more details kindly contact Thai Embassy where you have residency)

I think what you suggest is doable. I dont really know, I have not tried. I am 45 without a wife so I haven't tried dependancy visa, but I think you can.

Thailand is great I love it here and I think you will too.

Also this groups is for every kinda of question related to Thailand and you are in the right place.

Best of luck to you