Impact ages and meteorite ages
Bill Hartman has a much better take on this, IMHO...
He faces up to the same discrepancy between old surface ages and young meteorites and suggests that the old terrains are made up of smashed-up gravelly rubble, and the young terrains are new igneous rocks and are therefore stronger and more likely to survive impact ejection.
It's a good model...
(The old terrains are smashed up, because there were more impact early on. Later lavas and intrusions have survived because there were fewer impacts...)