How do you prove that the Earth is older than 10,000 years?

Originally shared by Sabine Hossenfelder

How do you prove that the Earth is older than 10,000 years?
Mesosaurus fossil. Probably dating back to the early Permian Period, roughly 300 million years ago. [ Image source ] Planet Earth formed around 4.5 billion years ago. The first primitive forms of life appeared about 4 billion years ago. Natural selection di...