According to [NASA.gov](https://www.nasa.gov/): "Astronomers estimate that the Big Bang occurred between 10 and 20 billion years ago. They estimate the age of the Universe in two ways: (a) by looking for the oldest stars; and (b) by measuring the rate of expansion of the Universe and extrapolating back to the Big Bang."

Source:https://imagine.gsfc.nasa.gov/science/questions/age.html#:~:text=Astronomers%20estimate%20that%20the%20Big,back%20to%20the%20Big%20Bang.
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