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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 discovery of rocks as old as 4.28 billion years pushes back the age of the most ancient remnant of Earth's crust by 300 million years. McGill University researchers have discovered the oldest rocks on Earth â a discovery which sheds more light on our planet's mysterious beginnings.