There is a star, called HD 140283, and nicknamed "Methuselah star". It is a very old low metallicity star, indicating that it is probably an early Population II star.
NASA released in February 2003 show that the first stars formed when the universe was only about 200 million years old. Scientist revealed that the universe is currently about 13. 7 billion years old. So it was very early in the time after the Big Bang explosion that stars formed.
The star is very old, but the uncertainty of its age is huge. From what we know about stellar evolution, there is a range of its possible age, 14.46 ±0.8 billion years, or between 13.66 to 15.25 billion years. The age has been inferred from studying other stars and from computer simulations of the evolution of this kind of star based on quantum mechanics. That also means that there is a huge age span of about 1.6 billion years or more than 10% of its inferred age.
Of course, journalists jump on the "14.46 billion years" figure, and not the "0.8 billion years" figure. This means that it becomes known as the star that is older than the universe by people who missed the “0.8 billion years” detail.
Thanks to the huge uncertainty, parts of the age range of HD 140283 fall comfortably inside the range of possible ages of the universe, currently thought to be 13.79 ± 0.021 billion years. Even if scientists believe that the first-star formation happened about 200 million years after the bang, there is still an overlap between 13.66 to 13.81 billion years ago in which the star could form.
In the end, the astronomers estimated that HD 140283 was born 14.5 billion years ago, plus or minus 800 million years. Further observations could help bring the Methuselah star's age down even further, making it unequivocally younger than the universe.