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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.
Furthermore, they are generally not aware that the big bang contradicts the Bible on a number of points and has many scientific problems as well. According to the big bang idea, the universe is nearly 14 billion years old; whereas the Bible indicates that the universe is about 6,000 years old. For those who claim to believe the Bible, this difference alone should be sufficient reason to reject the big bang.