The age of a fault is typically younger than the rock in which it is found because faults are formed as a result of stress and movement within the Earth's crust. When the rocks along a fault line are under stress, they may fracture and slide past each other, creating a fault. This movement and fracturing of the rock is a relatively recent event compared to the age of the surrounding rock, which may have formed millions or even billions of years ago. Therefore, the age of the fault is younger than the rock in which it is found.
