How can you measure the age of the universe?

Question: How can you measure the age of the universe?
- Keywords:
  age,
  measure,
  universe
Asked by imy to Carolyn, Peter, Richard, Sara, Siana on 12 Nov 2015.
- Richard Unwin answered on 12 Nov 2015:
  
  I don’t pretend to understand this, but apparent astronomers measure radiation and the distances between stars, and how quickly they are moving away from each other, and work these back to the time of the Big Bang. Our universe is about 13.7 billion years old.

Question: How can you measure the age of the universe?