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There are two basic approaches: relative age dating, and absolute age dating.

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Unlike people, you can’t really guess the age of a rock from looking at it.For example, looking at a series of layers in the side of a cliff, the younger layers will be on top of the older layers.Or you can tell that certain parts of the Moon's surface are older than other parts by counting the number of craters per unit area.The old surface will have many craters per area because it has been exposed to space for a long time. If you assume that the impact rate has been constant for the past several billion years, then the number of craters will be proportional to how long the surface is exposed.However, the crater number relation must be calibrated against something with a known age.The recent news article on a meteorite that originated on the moon was able to list the major impact events it experienced while on the moon, and to date them.