@Giovanni ***************
One thing to remember and take to heart,
NEVER EVER trust an immigration officer INSIDE the country about anything you can do visa-wise at a thai embassy OUTSIDE the country
AND
NEVER EVER trust an embassy official OUTSIDE the country about anything you can do visa/extension-wise at an immigration office INSIDE the country.
They are two completely different governmental agencies (who seem to rarely interact other than to contradict one another ๐ )
When you go to talk to the immigration office tell then you and your spouse are comin' in on 90 day Non-O visas, you for retirement and your spouse based on trailing spouse.
Leave it at that and ask the requirements so you can get your retirement extension and what is needed to be done as far as any certification of your marriage certificate so your spouse can get the matching trailing spouse extension.