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So it seems safe to estimate that the age of the Universe is at least 15 billion years old, but probably not more than 20 billion years old. This matter is far from being settled by astrophysicists and cosmologists, so stay tuned. There could be radical new developments in the future.
The Official String Theory Web Site:--> Cosmology :--> How old is the Universe? The age of the Universe has been a subject of religious, mythological and scientific importance. On the scientific side, Sir Isaac Newton's guess for the age of the Universe was only a few thousand years.