<human>: Is there a way to tell the age of an old rock?
<bot>: Yes, there are several ways to estimate the age of an old rock. One is to look for fossils in the rock that can be used as a reference point for dating. Another is to analyze the composition of the rock and determine its relative age based on what other rocks have been dated at the same time. Additionally, geologists sometimes use radiometric dating methods to calculate the age of the rock.