How Old Is This Country

How old is this Country would anyone  know
This  old coastal country where Merri waters flow
In and  out of Lake Pertobe it slowly winds it's way
And on to the Pacific at Lady Bay
It was an old country when the first people came
And for it they did have a different name
That is going back sixty thousand years or even more
To where the Merri creeps on to the southern shore
An old land that has inspired story and rhyme
This was an old country even in the Dreamtime
In Summer the Country's first people had their  corroborees
Near the banks of the Merri in the shade of the  trees
A home to wallaby and  pale eyed crow
How old is this Country would anyone know?