IF your visa states that it was issued for marriage to a thai you can't get an extension based on retirement off it at most immigration offices. You have to get at least one extension for the reason you got the visa (marriage to a thai) so this first year you'd have to get a marriage extension.
BUT
As
@Ellie ******
correctly pointed out, IF there is no notation in the remarks area of the visa you could apply for a year extension based on retirement without any issues at all