The astronmers calculate the age of the universe from the time it took for the light from the most distant objects to reach us. They need to include the time it took the universe to expand and carry that most distant object out to 13billlion light years. Once the expansion of the universe is included it should be added to the time it took for the light to be observed. The age of the universe is now calculated to be 35 billion.
The universe had to expand first.
Author: Nicholas
Our picture of the universe is 13 billion years out of date. It always will be out of date even more so in the future.