Answer :
13.8 Billion years. This isn't a definitive answer, but an estimate that scientists were able to give.
Hi!the universe is about 13.8 billion years old.We do not know the exact age of the universe, but we believe that it is around 13 billion years - give or take a few billion. Astronomers 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.