About how many years ago was Dinosaurs extinct from the earth

How old is the earth

I am pretty sure the earth is billions of years old. Dinosurs were extinct millions of years ago.

Many Theories, No Proof. Dinosaurs roamed the earth for 160 million years until their sudden demise some65.5 million years ago, in an event now known as the Cretaceous-Tertiary, or K-T, extinction event

and

earth is 4.543 billion years old