@Colin ******
I have gone over this time and again on the group. No matter what every Tom Dick and Somchai foreigner and thai official alike call it, there is NO such thing as a retirement visa, Period, end of story.
There are TWO things commonly referred to as a retirement visa
There is a 90 day Non-Immigrant Type O <-(O meaning other) visa issued based on being over 50 and then a yearly extension of stay from the immigration office for the same reason. The ONLY place the word "retirement" appears is in engrish 90 day Non-O and on your extension of stay . The officials do that for the ease of the foreigners because the real reason for that visa and extension is actually กรณีใช้ชีวิตในบั้นปลาย <- in the instance of living out the end of your life.
The other thing called a 'retirement visa' is a year-long, multi-entry Non-Immigrant Type O-A (Long Stay) visa gotten from a thai consulate in your country BEFORE you come here. You can use funds in your country to meet the financials. This visa requires a police back ground check and a medical certificate.
BUT NEITHER of those is a "retirement visa". :/ They are issued because you're over 50.