I worked and paid taxes for almost 50 years. For the last 8 years I spent 6 months of every year, except the Chinese Virus ones, in Thailand.
I advise Centrelink of my away dates and invariably lose the aged pension supplement and pharmacy allowance after a month or three. I don't recall exactly.
I keep a residence and my Oz bank accounts going.
Reportedly I'm 'grandfathered' under older Centrelink rules and aren't penalized when I leave Australia for a lengthy period every year. I seem to have fallen into a 'sweet spot' with big brother Centrelink, and have never lost the basic pension🙏