What is the longest a star can live?

To a creature that only lives for a few decades — less than a millionth of a percent of the Universe’s total age — a star is so long-lived that it may as well survive forever. Despite the fact that there are hundreds of billions of stars within our Milky Way alone, most of the humans that have ever lived have never seen a star die with their own unaided eyes. Here in our own Solar System, our parent star, the Sun, is already nearly 4.6 billion years old, yet it will be another 5-to-7 billion years before our Sun enters its final evolutionary stages: when it will become a red giant, expel its outer layers, and contract down to become a white dwarf. But stars come in great varieties as far as their mass, color, and lifetimes go. Even though our Universe has seen an impressive 13.8 billion years pass since the start of the hot Big Bang, forming more than a sextillion (~1021) stars in the part that’s observable to us over that duration. Although many of those stars have already lived-and-died, most of the stars that have formed are still alive, and most living stars will outlive the Sun by a significant amount. <a href="https://medium.com/starts-with-a-bang/what-is-the-longest-a-star-can-live-26b7cda473ce">Click Here</a>