No, every entry is at the discretion of the Immigration Officer holding your passport especially when using Tourism entry stamps, take nothing for granted despite what others "got away with" in the past, now is the present
A one year Extension of Stay costs 1900B and re-entry permits at 1000B each (3800B for multi entry) plus the need to meet the financial requirements (800k, 65k or income affidavit)- that's all that's needed.
Check the requirements on your local Thai Embassy website for a retirement Non-O, the financiall requirements will be clear, equivalent of at least 800k Baht in local currency