Pretty tall I reckon, but, they are only youngun's.
Dear old Oz, is the oldest landmass on the planet.
PS. I still haven't got off the farm yet. Went to shower, turned the tap (fawcett) no bloody water. Do the tour of 3 miles of waterline across the paddocks. Found 4 leaks. Bloody Hell.
Fixed now. Now, maybe, I can get spruced up, in the "sunday go to meeting clothes", and go pay some bills.