I read that Methuselah was once thought to be 16 billion years old, but after refining the distance it was decreased to 14.5 billion years old. Also, scientists still aren't 100% positive of its age. From what I understand, they can still refine the distance even more which will likely put its age under the calculated universe's age.
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The star could be as old as 14.5 billion years (plus or minus 0.8 billion years), which at first glance would make it older than the universe's calculated age of about 13.8 billion years, an obvious dilemma.
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Once the true distance is known, an exact value for the star's intrinsic brightness can be calculated. Knowing a star's intrinsic brightness is a fundamental prerequisite to estimating its age.
From the NASA.gov website
This post was edited by Diablo2Guides on Aug 10 2013 09:53pm