Di0z,
I am fairly confident you will qualify for Irish Contributory pension.You probably have 12 @ 52 = 624 payments made.
Once you have over 520 you should qualify for a reduced pension. Depending on your age now, that could be 66.
Write to Dept of Social Protection, Buncrana , Co Donegal, and get a statement of payments you have made.
You can then juggle if it will be more profitable to take Irish and Australian pension or just add 12 years to Australian one.
ps. the cheek of you senile @ 66 ! (you will be surprised how time speeds up ! and you are the oul one!)