"Now that's interesting. The first thing that came to mind was one theory of how our moon was formed. With water that early on Earth and 4.5 million year old dry moon rocks it just how old was Earth when the impact occurred?"

The impact with the prior Moon would reset the clock on all material on the Moon and Earth. Right after the impact the entire Earth would molten, it's atmosphere may still have Nitrogen and CO2 but it's very hot- obviously much hotter than Venus is currently. I suppose that such things as Iron gas could part of atmosphere- sulphur gas definitely.
The stuff ejected that becomes the Moon could vary from solid, liquid, and gas. Just as it is possible that intact rocks can be ejected by a impact from a planetary surface, one could have solid rock from the proto earth being ejected into obit, but all stuff ejected from Earth which forms the moon will be turned molten by process of forming the Moon.
I believe that it's thought that the Sun was formed into a star [had enough material to start a fusion reaction] about 5 1/2 billion years ago. It's possible that even before this planet were forming- especially gas gaints such as Jupiter. And after this the Proto Earth and proto Moon had a billion years to form- which is lots of time.