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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.
When the rock rises, it pushes the plates apart just a tiny bit each time, and when it meets the ocean water it solidifies, creating new ocean floor. If you were to look at an age map of the Atlantic (link below), you'd see that the youngest floor is closest to the MOR, the oldest floor is distant from the ridge. The oldest seafloor anywhere is in the Pacific, near the Marianas subduction zone -- pretty much as far as you can get from the MOR (a spreading center).