“This question implies the Earth’s age, like its shape, can be directly measured—well it can’t, it’s a category-mistake.3 Earth’s age can only be inferred and depends upon the worldview of the investigator. The philosophical assumptions behind these dating techniques invalidate any supposed claim for rocks being reliable clocks, so are not “proven results of science””
See more about this question and 9 other questions here: https://creation.com/10-answers-from-creationists-1