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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 whole rocks found so far date back about 4.28 billion years. They were found in 2001 by geologists excavating near Canada's Hudson Bay in northern Quebec, andthe research appeared in the Sept. 25, 2008, issue of the journal Science.he oldest rocks in the grand canyon are about 2 billion years old, but they are not even half the age of the oldest known rocks on earth. Credit: The National Park Service View full size image.