The Bible gives the ages of the patriarchs at the age their descendents were born, and then so on. It was from this that Mr. Ussher worked out his timeline. The Bible is the only book in the world that tells us about our past, our purpose, and our future. Scientists attempt to date the earth by assuming they know how much of a certain element should be in rock or in life forms (living or dead). This is an assumption on their part, which does not take into account the levels in rock during the Creation itself. The Bible gives us a timeline based on the ages and births of living men, showing itself to be oriented toward the lives of men. 4.5 billion years old? Think people. That is ridiculous. The earth was created for man.