I've heard stated by experts that the approximate age of our universe is about 13.5 billion years of so. The thing that doesn't make sense to me about this is that we can see more time than this. The famous Hubble deep field shot taken in the northern hemisphere shows about 13 billion years or so into the past and the other deep field Hubble shot to the south is about 12 billion years. Add them together and we can see more than 25 billion years of our universe's history and it seems to have looked quite similar to what we see in the more recent universe. Am I missing some fundemental fact here?