If you mean a retirement visa as in Extension of Stay based on 50 years of age, you need OR an income affidavit from your Embassy with minimum 65.000 Thb income a month OR if your Embassy does not provide, at least 12 months prior application a monthly foreign deposit of minimum 65.000 Thb into your Thai bank account.
If you mean to apply for a visa before you visit Thailand, like the retirement visa as in application for a new Non Immigrant O or O-A or O-X visa, please look at the requirement of the Thai Embassy in the country where you apply.
I hope you can understand that we can not tell what an unknown Immigration Officer at an unknow immigration booth at an unknown international airport in Thailand on an unknown date will do. For sure we can tell he will do his job, if that is with or without asking a question is his/her personal decision.