>>4270295HD 140283 aka "Methuselah Star" is currently the oldest known star.
A simplistic analysis of its age leads one to believe it is 14.3 billion years old, which does not make sense since the universe is only 13.83 years old. Astronomers, after refining (i.e., fudging) their analysis now conclude it is 13.6 billion years old, or a mere 230 million year younger than the universe. Since the Milky Way galaxy is only 13.2 billion years old, HD 140283 must have formed elsewhere and was later swallowed by our galaxy.
It is only 190 light-years away...