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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 very oldest rock was discovered in Canada in 1999, and estimated to be just over 4 billion years old. This set a minimum age for the Earth, but thanks to geologic processes like weathering and plate tectonics, it could still be older.