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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.
Report Abuse. The oldest rocks on the continents are much older than those on the sea floor. The oldest rocks on the continents are between 3.5-4.0 billion years old. Rocks of this age have been found in the centre of ancient continents-the Canadian Shield, Australia and Africa.he oldest rocks on continental crusts are generally in the center of the continent, while the oldest rocks of ocean crust are generally farthest away from the ocean-ridges.