you might just stop in to your immigration office and see if you can do an in country conversion to a 90 day Non-O visa based on being over 50 (retirement).
Most immigration offices will do it IF you have 15 days or more left on your current entry 30 day visa exempt or 60 day tourist visa entry stamp. A few immigration offices want you to have 21 days left though.
That might be an easier way for you to get the 90 day Non-O visa..
To get a 90 day single entry Non-O visa based on being over 50 from the thai consulate in Savannakhet you need a police background check from thailand, a medical certificate and your bank book showing you have 800K baht in it OR a letter from your consulate stating you get 65K baht a month
Even then you might not get it issued. Both Vientiane and Savannakhet seemed to have tightened up on issuing them.