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There is no independent natural clock against which those assumptions can be tested.For example, the amount of cratering on the moon, based on currently observed cratering rates, would suggest that the moon is quite old.See The Universe’s Birth Certificate and Biblical chronogenealogies (technical). Here is an article about it: How does Göbekli Tepe fit with biblical history?
If the age calculated from such assumptions disagrees with what they think the age should be, they conclude that their assumptions did not apply in this case, and adjust them accordingly.
Eran Elhaik of the University of Sheffield and Tatiana Tatarinova from the University of Southern California invented the Geographic Population Structure (GPS) test, which works by scanning a person’s DNA for parts that were formed as a result of two ancestors from disparate populations having children: for example, a Viking and Briton falling in love after Vikings invaded Britain in the 11 century.
Once a mixed DNA signature is detected, it is compared with reference data from people around the world that haven’t moved for hundreds of years.
Sooner or later that supposed evidence will be turned on its head and will even be added to this list of evidences for a younger age of the earth.
On the other hand, some of the evidences listed here might turn out to be ill-founded with further research and will need to be modified.
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Such is the nature of science, especially historical science, because we cannot do experiments on past events (see “It’s not science”).