How old is the Earth?

Usually people don't think of the earth having an age. But really the earth is 3.8 to 4.5 billion years old. Wow! I wish I could live to be that old!
But how is it possibile to find this stuff out? The oldest rocks which have been found so far (on the Earth) date to about 3.8 to 3.9 billion years ago (by several radiometric dating methods). Some of these rocks are sedimentary, and include minerals which are themselves as old as 4.1 to 4.2 billion years. Rocks of this age are relatively rare, however rocks that are at least 3.5 billion years in age have been found on North America, Greenland, Australia, Africa, and Asia.

The difference in how old the Earth could be is enormous, but unless there is clear evidence, who can really say how old the Earth is.

Here if you want to learn more...check this out:http://www.talkorigins.org/faqs/faq-age-of-earth.html