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Sure, you can scour the Internet and learn rather quickly that the scientific consensus pins the age of of the planet at about 4.6 billion years.But Google didn't invent this number; instead, human ingenuity and applied physics have provided it.
Scientists interested in figuring out the age of a fossil or rock analyze a sample to determine the ratio of a given radioactive element's daughter isotope (or isotopes) to its parent isotope in that sample.
U-Pb dating is often used to date igneous (volcanic) rocks, which can be hard to do because of the lack of fossils; metamorphic rocks; and very old rocks.
All of these are hard to date with the other methods described here.
This is because when radioactive elements first come into being, they are presumed to consist entirely of a single isotope.
Imagine that you enjoy a certain kind of ice cream flavored with chocolate chips.