I am a US citizen residing in Spain and headed to Thailand next week on a 60-day e-visa. After I return to Spain, I will decide whether I want to retire in Thailand and get a retirement visa. Two issues: I am healthy but age 70 and would prefer to avoid the expense of medical insurance. I can apply from Spain or Thailand - which type visa would work best - O or O-A? Also, Thailand wants a proof of income letter from the embassy, but the US Embassy doesn’t issue these anymore. What alternative is acceptable? Many thanks!