Is the "Methuselah" star older than the Universe?

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No. And here's
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Bond et al. (2013; open access) -

00:00 - Introduction
01:01 - The Methuselah star isn't the oldest in the Universe
01:50 - How we calculate the age of a star
08:23 - The age of the Methuselah star
09:45 - The age of the Universe
11:34 - There's no "before" the Big Bang
14:18 - Bloopers

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????????‍???? I'm Dr Becky Smethurst, an astrophysicist at University of Oxford (Christ Church). I love making videos about science with an unnatural level of enthusiasm. I like to focus on how we know things, not just what we know. And especially, the things we still don't know. If you've ever wondered about something in space and couldn't find an answer online - you can ask me! My day job is to do research into how supermassive black holes can affect the galaxies that they live in. In particular, I look at whether the energy output from the disk of material orbiting around a growing supermassive black hole can stop a galaxy from forming stars.
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