Can I ask a O or OA visa? . I still don't know the difference. My goal is to get a visa in Lao before my 50 years old and then wait 2 months in Thailand and last month ask for an extension of 1 year when I reach 50.

When can I ask for a visa in my case?

You can apply for the visa on your 50th birthday. You must be 50 years old on the date you apply for a single entry non-o visa.

You want a single entry Non O visa. You must have reached the age of 50 (e.g. if your birth date was 6 Feb 1967 you can apply on or after 6 Feb 2017) at the time you apply for the visa.