Hang on a second, I just want to point out that this doesn't have anything to do evolution. Whether or not evolution is true is irrelevant here. Geologists point to these conclusions for a number of reasons. In fact, lets suppose hypothetically evolution is true for a moment. There would be no reason that the earth would still have to come out to 4.55 billion years. It may take time for things to evolve, but there is nothing written in stone that it had to take that long. Why not much longer? Or much shorter? Could have just as well been 2 billion years. Or 8 billion years. Or 1 million years. As it turns out, many evolutionists in the late 19th century believed the earth was maybe millions or hundreds of millions years old. As better techniques were used and technology got better and things got more precises, etc... it turned out that everything was actually quite older than originally thought. People should always be willing to change their mind about things because we're all in this together and no single person has access to greater knowledge than anyone else. Unfortunately we can't Skype God or shoot him a text message on our iphones and ask him directly. That's just not how it works. Everything we know is a work in progress and nothing should ever be stated as absolute fact. But there are things that we're pretty sure about with a level of precision that gets pretty close to unchanging fact. We shouldn't be afraid of learning new things and changing our minds.
I mentioned a hypothetical assumption that evolution was true. Now let's assume it's dead wrong. That still wouldn't change what geologists say about the age of the earth. As it turns out, they do end up lining up pretty well, but nothing says that they have to. Could have went down a number of different ways. Same think with cosmology. I guess they don't know if everything started with the Big Bang, or if multiverse is true then time could be eternal. Either way still makes perfect sense and is in line with God as far as I'm concerned.
I'm not sure why you brought up evolution though. I wasn't trying to get in another discussion about it. You don't need evolution to have an old earth.