What about, for example, the age of the Hawaiian Islands? The Hawaiian Islands are the remnants of a long chain of islands, youngest in the southeast (i.e. Hawaii, where the active volcanoes are) and progressively older toward the northwest. A consistent relationship has been found between the distance of a volcano from Hawaii and its radiometric age.
How do you explain this: Using the estimated radiometric ages of the individual islands, and assuming uniform easterly movement, an estimate of 9cm/yr can be made for the Pacific Plate. Satellites have confirmed that rate.