LOL! Give or take a few billion years!
This implies you think that physics, geology and astronomy differ on their interpretation of the age of the Earth. Which one do you think disagrees with the others? Please provide citations.
Note to lurkers: As I pointed out, he's going to bluff this one out. Of course, he's done this a number of times before, so it wasn't really a major call on my part.
I too am interested in his answer.
In a general sense they may agree, but when "billions of years" are involved it's kind of hard to be precise, don't you think? Go ahead and posit your own belief in the age of the earth. We'll see if every scientist lurker who cares to add to the discussion agrees with your belief. Out of bias for your faith they might agree, but they certainly have no more entitlement to credibility than the next guy who adds or subtracts a billion years from your notion.
It's not just what I think. It's a fact. Agreement about the age of the earth in scientific circles is far from being established, and it should be that way, because science hasn't even figured out what time itself is.