The age of the universe has been put at 13.7 billion years. The oldest stars in the Universe are about 13 billion years, and there has been a continuous birth of new stars since that time. Our own star is about 5 billion years old, and life on Earth began (at the earliest) about 4 billion years ago, i.e. it has taken life that long to go from one-celled floating creatures in the sea to end up with us--presently, at least, because I shouldn't think we are the end-point of evolution by any means. Anyway, we can assume that similar planets to our own have probably existed in the Universe since 13 billion years ago, and roughly the same rules apply to evolution if you are given a similar environment. Therefore we could expect that life would evolve at roughly the same pace, and there would be species that were sentient about 9 billion years before we even existed. The point of this is that these species may have long ago become transcendent, and left behind the need for physical bodies. If so, they could be the super-beings who have become subsequently the guides for Humanity and other, younger sentient species in the Universe.