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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.
The oldest continental rocks are found in what we call cratons. A craton is a stable part of the continental lithosphere, which has survived several cycles responsible for the merge and the dislocation of supercontinents. Cratons are therefore always found within continents. Some cratons in Canada and Greenland shelter the oldest continental rocks in the world, about 4 billion years old. Other cratons in South Africa, Australia and Asia have 3 billion years old continental rocks. The oldest seafloor is comparatively very young: about 280 million years old. It is found in the Mediterranean Sea and is a remnant of an ancient ocean that is disappearing between Africa and Europe.