Advancing technology has allowed radiocarbon dating to become accurate to within just a few decades in many cases. Since fossil fuels are millions of years old, they no longer contain any measurable amount of Carbon-14.

Is carbon dating the most accurate?

Radiocarbon dating can easily establish that humans have been on the earth for over twenty thousand years, at least twice as long as creationists are willing to allow. They have their work cut out for them, however, because radiocarbon (C-14) dating is one of the most reliable of all the radiometric dating methods.