I have always been confused why it is said that the universe is 13.7 billion years old it just does not make sense to me. Why do we not say that the stuff that we can observe is 13.7 billion years old? We base this on the most distant things that we can see from our perspective here on earth right? Lets say that light traveled here from the most distant galaxy and then passed the earth and was observed by a civilization with a billion year head start on us and is a billion light years the other way. They would say that the universe is 14.7 billion years old. (I know that this is a very crude thought experiment by the way) I know that we look in all directions and get a pretty good idea of the formation of galaxies and a time frame for when stars started forming and all that but, we observe a far off galaxy and we see it in the position it was in all that time ago. From that galaxy's perspective it is nowhere near where it was when the light left it so many billions of years ago and in an expanding universe (Which is expanding faster than light according to some theories) should be another "x" amount of distance from the position that we see it in today farther out. I could be totally wrong about how we have put an age on the universe or misunderstood or even be using very bad logic. I am no astronomer for sure. Can someone clear this up for me?