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However, there are many methods that can be used to determine the age of the earth or other objects.
The textbooks focus on relative dating, based on the layering of the rocks, and radiometric dating.
The reason this age may not be a true age—even though it is commonly called an absolute age—is that it is based on several crucial assumptions.
These must be accepted on faith in uniformitarian and naturalistic frameworks.
The claimed “fact” that decay rates have always been constant is actually an inference based on a uniformitarian assumption.
It is true that radioisotope decay rates are stable today and are not largely affected by external conditions like change in temperature and pressure, but that does not mean that the rate has always been constant.
There is also a difference in the timescale used to explain the layers.
Determining the relative age of a rock layer is based on the assumption that you know the ages of the rocks surrounding it.