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Thats simply ridiculous. No one knows, and no one will probably ever know.. There are just to many unknown factors for a race that has been relatively intelligent for thousands of years, and somewhat intelligent for a few hundred years to predict how old the earth is, specially when those predictions amount to 910.000 times more than 5000 years, which is approximately when our intelligent civilizations started. If you divide 4.55 billion by 300 which is the time we have been intelligent compared to the 4700 years... Yeah you get it, its ridiculous to assume the age of the earth, just like its ridiculous to assume to creation of the universe from something you see in a telescope.
Too many unknown factors, too little knowledge, too simple intelligence.
So your argument is that because we were dumb a few thousand years ago we can't figure out stuff now? By this standard plasma tvs, space travel, instant telecommunications should not logically exist. I mean obviously these things were not achieved/created in part due to our own understanding of the technology that came for it but also technological advancements in every field related to it. Your argument is simply ludicrous. But here I'll let the science do the talking :
NASA - Earth
Scientists think that Earth probably formed at about the same time as the rest of the solar system. They have determined that some chondrite meteorites, the unaltered remains from the formation of the solar system, are up to 4.6 billion years old. Scientists believe that Earth and other planets are probably that old. They can determine the ages of rocks by measuring the amounts of natural radioactive materials, such as uranium, in them. Radioactive elements decay (change into other elements) at a known rate. For example, uranium gives off radiation and decays into lead. Scientists know the time it takes for uranium to change to lead. They can determine the age of a rock by comparing the amount of uranium to the amount of lead.
The known history of Earth is divided into four long stretches of time called eons. Starting with the earliest, the eons are Hadean, Archean, Proterozoic, and Phanerozoic. The first three eons, which together lasted nearly 4 billion years, are grouped into a unit called the Precambrian. The Phanerozoic Eon, when life became abundant, is divided into three eras. They are, from the oldest to the youngest, the Paleozoic, Mesozoic, and Cenozoic eras. Eras are divided into periods, and periods are divided into epochs. These divisions and subdivisions are named for places where rocks of each period were studied. Periods are mostly separated by important changes in the types of fossils found in the rocks. As a result, the lengths of eras, periods, and epochs are not equal.
A chart showing an outline of Earth's history is called a geological time scale. On such a chart, Earth's earliest history is at the bottom, and its recent history at the top. This arrangement resembles the way rock strata are formed, with the recent over the oldest.
Formation of Earth
Is this REALLY the way you want to go down?