I think you're referring to the age of the universe here? But due to inflation, although the universe is 13 billion years old, the observable universe is quite a bit bigger than that (i.e. we can see stars much further than 13 billion light years away).
For a more specific measurement: NASA says 2.4 arcminutes across[0].
[0]: https://webbtelescope.org/contents/media/images/2022/038/01G...