@Ken *****
nope, as
@Jon *****
pointed out a Non-Immigrant Type O visa <- the O means "Other reason" is issued for a variety of things, being over 50 (retirement) is just one of them. Married to a thai, married to a foreigner who legally works here or is retired here, raising half thai children, raising foreign children in school here, missionary work, volunteering, etc.
Inside thailand you can only get a 90 day Non-O visa and then you apply for an extension when that time runs down. They don't sell Non-O visas longer than 90 days at the immigration offices