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The oldest such minerals analyzed to dateâsmall crystals of zircon from the Jack Hills of Western Australiaâare at least 4.404 billion years old. Comparing the mass and luminosity of the Sun to those of other stars, it appears that the Solar System cannot be much older than those rocks.
Determining the Relative Ages of Rocks [edit]. The relative age of a rock is its age in comparison with other rocks. If you know the relative ages of two rock layers, you know which is older and which is younger, but you do not know how old the layers are in years.he principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top. Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: 1  Layer C formed. 2  Layer B formed.