Read the part with the red back ground,

specially the last few words

@Paul **********

You make it complicated.

IF you have a VISA based on being over 50 years of age the answer is NOT the first Extension of Stay as this has to be for the same reason why the visa is issued.

IF you have a VISA based on marriage with a Thai Citizen, your wife, than yes and yes there is a financial requirement

@Don ************

You can leave Thailand without problems before the last date stamped in your passport as admitted until xx/xx/xx

@Don ************

IF the visa is issued due to having Thai family members you can apply for a 60 day Extension based on visiting family.

otherwise it will be a 1 year Extension of Stay but you are allowed to leave after 1 month

NO, you can not renew a used visa.

NO, you can NOT apply for a new 1 year Non Immigrant O visa,

Sorry to disappoint you and others, but that type of visa is out of stock, you can buy the Single Entry Non Immigrant O visa which gives you once 90 days of stay and than you need to extend inside Thailand with 1 year at Immigration

OR

you might choose for the Multiple Entry Non Immigrant O-A (long stay) visa, but this has more requirements like police check and health insurance.

For information:

5

Just read the note next to the loud speaker and you know when it will be effective.

@Todor *******

IF you are outside Thailand you can use another passport.

Just to answer your question:

NO, you can NOT apply for a new visa using another passport while being inside Thailand.

@John *********

As not every of the over 80 local Immigration Offices has the authority and clearance to perform conversion of stay into a Non Immigrant visa