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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.
Scientists haven't sampled enough sites to find older rocks. Ocean floor is dispersed by volcanic eruptions. The age of Earth is 200 million years. As the lithospheric plates move around, most of the ocean floor rocks are pushed up to form mountains. Due to tectonic activity, rocks on the ocean floor are continually recycled.