This is not a new discovery. The article you linked to is a decade old.
In the world of Astronomy, the issue has never been settled and careers in this space, are built around researching the issue, not the assumption that the question of the age of the universe is set in stone. That's how you end up with different theories.
A decade ago, the suggestion was that the universe may be 100 Million years older than previously thought. More recent (within the past 3-4 years) observations, suggest it's possibly hundreds of millions of years younger than previously thought.
Expansion, represented by the Hubble constant, is calculated based on the age of the universe. More recent measurements, suggest a 67.6 Km/Sec/Megaparsec. Translation: A point in space, that's 1 megaparsec, or 3.26 M light years away, moves away at 67.6 Km/Sec. The Planck Sat team observed 67.4, both close to each other, and both slower than 74, which is inferred from the measurements of galaxies.
This will be an open research topic, for generations to come.
