@Benjamin *****
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section 2 eligibility 3rd point : 2. Eligibility
Applicants must be aged 50 years and over (on the day of submitting application)Applicants must be nationals and passport holders of eligible countries, namely; Japan, Australia, Denmark, Finland, France, Germany, Italy, Netherland, Norway, Sweden, Switzerland, United Kingdom, Canada and United States.Applicants must apply for visa at the Royal Thai Embassy/Royal Thai Consulate-General in the country of their nationality or where they have a permanent residence so i guess if you have been living in thailand for a year or more on some status then thailand could be deemed your place of permanent residence.