@Virgy *******
Again, not clear. What kind of "Retirement Visa" -- O-A, O, LTR ? If O-A, and 1-yr validity just ending, yes you can get re-stamped for another 1-yr (not new Visa). If O-A, and already used re-entry stamp, yes you can leave and try to apply for new one. OR, you could leave, and re-enter Visa Exempt and then change/convert to Non-O Retirement inside Thailand, and 1-yr Extensions thereafter. If already on a Non-O with 1 yr Extension, you do not leave, you just keep extending. Kindly provide better details, and you might get better advice.