I agree with
@Rob***
, there is no need to contract a lawyer to push-paper for you to get a Non-O visa, then a yearly extension of stay based on being over 50 (retirement) and then getting your wife to "piggy-back" onto your extension.
Depending on where you're going to live, you'll have to use the immigration office in that area, but most offices have a sheet in thai and english they hand out which explains how to do the process, what documentation is required, etc.