I'm not sure what you are asking, but I will attempt to clear some doubt here. Most people who take the creation account as historical believe that the Earth is 6000-7000 years old.
From a scientific point of view, you can use half-lives to tell how old things are. However, to have a starting point, assumptions must be made. For example, in physics, you can scientifically tell where a ball is going to land, but you must make some assumptions, about some external factors (that you do not know) that might change the course of the ball, such as air or physical interference. In the same way, assumptions must be made in dating techniques.
Carbon-14 dating, is a technique used to find how old organic material, a living thing, is. For Carbon-14 dating, the assumption that the amount of it has always been constant, which is not necessarily true, must be made. Experiments by Dr. Willard Libby, founder of the Carbon Dating method, found this to be untrue.
What the Bible says stands. The Bible is not there to explain certain scientific experiments that, as revolutionary as they may be, could be based on erroneous assumptions. Time and time again, scientific 'fact' has been proven incorrect, more recently absolute zero. The Bible has never been proved wrong, and it is my firm belief that it never will, for it is the Word of God.
For more information, read these articles:
Doesn’t Carbon-14 Dating Disprove the Bible?
Is Carbon-Dating Accurate?