As time progressed each would begin to acquire its slower modern-day stable half-life, but would they all acquire these stable rates in a uniformity which would keep them all in synchrony? If they did, all would give the same ages, you are right.
Each would probably arrive at equilibrium at different times.
What would happen if a dinosaur bone were carbon dated?
- At Oak Ridge National Laboratory, Scientists dated dinosaur bones using the Carbon dating method.
Wouldn't this make all the rocks appear the same age?