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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.
With increasing distance from the axis of the ridge, the rocks become older, thicker, and cooler. They also have more sediments above them. Seafloor rocks are oldest near the edges of continents or deep-sea trenches.But even the oldest seafloor rocks are less than 180 million years old. This is much younger than the oldest rocks of continental crust.This means that seafloor is destroyed in a relatively short time after it is created. Compared with seafloor rocks at the center of mid-ocean ridges, seafloor rocks sampled at a distance from mid-ocean ridges are. 2  older. 3  hotter. 4  thinner. 5  all of the above. 6  Continents drift because they are pushed by. 7  crashing ocean waves. 8  spreading seafloors. 9  erupting volcanoes.