I must confess I’m confused because on the Thaivisa.go.th website, which facilitates the online application process, there is no mention of a 90 day non imm O visa for retired people, only visiting family & friends plus a number of other categories (medical, voluntary work etc.).
Pre-covid I had always travelled on a non imm O visa but that doesn’t appear to be an option either by omission (probable, Thai websites aren’t the most user friendly
)or has policy changed?