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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.
1 The oldest rocks on Earth, found in western Greenland, have been dated by four independent radiometric dating methods at 3.7-3.8 billion years. 2  Rocks 3.4-3.6 billion years in age have been found in southern Africa, western Australia, and the Great Lakes region of North America. Rocks 3.4-3.6 billion years in age have been found in southern Africa, western Australia, and the Great Lakes region of North America. 2  These oldest rocks are metamorphic rocks but they originated as lava flows and sedimentary rocks.