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Aseyhe t1_jb47564 wrote

The Planck 2018 paper gives 13.787 ± 0.020 billion years, so that's an uncertainty of 20 million years. That's from the cosmic microwave background.

However, supernova-based measurements of cosmic expansion favor about a 7% higher expansion rate, which could imply the universe is younger by of order a billion years. This discrepancy is the "Hubble tension", a major current research topic.