@Steve ****
No, it sounds like you came into the country, applied for a 90 day single entry Non-O visa for 2000baht and then applied for a yearly extension based on being over 50 at the immigration office for another 1900baht.
What I was saying is IF you have a foreign wife she doesn't need to have the 800K baht or 65K baht income to get her yearly extension, she doesn't even need to be over 50 either :O .
She'd just "piggy-back" onto your yearly extension based on being the wife of someone who has a yearly extension of stay here..