Still working in the UK, aged 63, want to spend 2x90 days in Thailand per year, not married.

What’s the best visa?

Would also appreciate any recommendations on health insurance ( not travel ) for while I am there that would pay the hospital direct, no underlining medical conditions.

Thanks for your time fella’s

Hello and thanks for having me in this forum. I searched posts here and so hope this isn’t too much of a repeat. I am a US citizen recently turned 50 coming to Thailand on the 45 day exemption stamp. I am going to apply for a non-immigrant O visa when I arrive once I open my bank account and secure a long term rental. I am wondering what others in a similar situation have found applying for the visa if there are any caveats or things I should be aware of to avoid having my application denied. Any suggestions are appreciated.