You need to go to Jomtien to get their latest requirements list, Jometien has very specific their own requirements.
Here is just FYI, general requirements from Immigration Bureau HQ. Again, Jomtien has different detailed conditions from this.
For example, you need to have funds to sit in your bank account for 2 months if you use the banked money method for an in-country initial visa.
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/9.FOR-RETIREMENT-PURPOSES-50-YEARS-OLD-NON-O.pdf