The layers of rock may be relatively dated, from youngest to oldest

That's true. This is possible through relative dating.

Explanation:

Relative dating establishes the chronological sequence of events (which happened first and which happened later) or fits a particular rock or formation within a certain time interval (Eon, Era, Period, Epoch) of the geological time scale. However, it does not allow you to identify your true age, that is, it does not assign a date or numerical age in its broad sense. This allows for a greater understanding of our planet and is crucial in areas such as stratigraphy and paleontology.