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Best Answer: The age of continental rocks are older than that of sea floor rocks. Ocean crusts form and deplete rapidly, and are generally quite young (180 million years or so for the oldest). Continental crusts generally are older (billions of years) because they deplete slowly, and mainly through erosion.
Home âº Expeditions âº Expedition 335 âº So How Do Scientists Figure Out How Old Rocks Are? To figure out the spreading rates of various places in the seafloor, scientists compare the ages of rock samples taken from those places. It is not easy to figure out how old a rock is. They do not have growth rings like a tree nor do they have bruises caused by their aunt Barbara pinching them to grow an inch every time they have a birthday.