Full Idea
We now know the age of the universe to four significant figures. It is 13.72 billion years old!
Gist of Idea
The universe is precisely 13.72 billion years old
Source
Lawrence M. Krauss (A Universe from Nothing [2012], 05)
Book Reference
Krauss,Lawrence M.: 'A Universe from Nothing' [Simon and Schuster 2012], p.87
A Reaction
It amazes me how many people, especially in philosophy, would be reluctant to accept that this is a know fact. I'm not accepting its certainty, but an assertion like this from a leading figure is good enough for me, and it should be for you.