When seeing how old a spear/ arrow head is how do they know the age of when it was carved/made and not how old the rock itself is?

Question

When seeing how old a spear/ arrow head is how do they know the age of when it was carved/made and not how old the rock itself is?

In: Earth Science

Answer 1

Most fossils and tools are found at certain levels in the ground.

This is a good starting point for age verification but it’s never 100% perfect which is why we say “dated to be between X age and Z age”