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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.
To the oceanward side of the deep trenches the ocean lithosphere is amongst the oldest on Earth. For example, the oceanic crust adjacent to the Marianas Trench, the deepest trench on Earth, is Jurassic in age and up to 180 Ma old.