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What could explain the measurements that the Methuselah star is older than the universe?

So there has been talk in the news of a star named Methuselah that is "older than the universe". Moreover, this star happens to belong to our very own Milky Way.

I must admit that I only have a modicum of familiarity with stellar evolution, and so these incredible headlines have left me strapped with questions:

  1. How reliable is this research?
  2. What method do they use to measure the age of such a star as Methuselah?
  3. Which is more likely to be wrong, the age of Methuselah or the current estimate of the age of the universe?
  4. Could relativistic effects account for some of the age?