Ok but my position is that God created them the same way they are naturally made which would mean that they would not only look old but they would have all the same characteristics of an old rock.
In nature when the rocks are formed they are composed of a particular isotope.
Over time the isotopes decay at a consistent rate. So some of them change to a different isotope.
The scientists can tell how old the rock is by checking how much of a percentage of the rock is of the decayed isotope.
So in essence, when the rock is new it is shiny (shiny meaning, composed of a particular isotope) and overtime it gradually decays into a different isotope (losses its shine).
If God created the rocks the way that nature creates them then gods rocks are going to be composed as shiny (with the original isotope) and it would take time for these atoms to decay. Scientists measure how much decay has happened, they know the rate of decay (the half life) and so they can work out how much time has passed since the rock first formed.
If god wanted to make his new rocks to look old, then god would have had to make rocks that are already decayed. God would have had to make his rocks differently to what happens naturally. God would have had to have put already decayed isotopes into his new rocks.
Let's just say that god did this. Now because of this detail that god did, it makes scientists think the rocks are millions of years old. Scientists date things based on many different methods and everything comes together consistently to tell a consistent story. This means, that if god did it, then god was very careful to construct a planet and universe to make it look consistently old, to tell a story for scientists to discover. Scientists aren't making stuff up, they are discovering this story that god is telling. Isn't it fascinating that god left this message for us and that scientists are discovering god's message?