Can I apply for a retirement visa in Thailand before the last 30 days of my visa-exempt entry?

Sorry people, I deleted some of the off topic comments.

This post is about getting the initial 90 day non-o Visa based on being over 50 (retirement) inside the country at the immigration office where they live.

While it is true, not every office does issue in country non-immigrant visas, most do.

You need to have the minimum required days that your application goes under review at that specific office left on your current stamp either a free entry stamp or a tourist visa entry stamp to apply for this Visa.

Most offices require 15 days or more left on the stamp some offices Chiang Mai require 15 business days or more which equals out to about 21 calendar days give or take.

You need those days on your current stamp because while your application is under review you are still here on your existing stamp.

You seem to be mixing some information. What you are referring to is the conditions for applying for a 1-year extension after obtaining an in-country visa for a 90-day initial stamp.

For an initial in-country visa application, there is no condition about maximum remaining days with your current stamp, while there is one about minimum remaining days, 15 days or 21 days, depending on the local immigration office.

You can apply for an in-country visa even on the next day you arrive, as long as you meet the requirements.