this post was submitted on 11 Sep 2023
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A civilization that started in the first billion years of the universe would be immediately destroyed by the violent nature of the early universe.
That basically continues to be true until about 7.5-8 BYA. So at max a species might have 3-4 billion years on us. Even that's a bit debatable as the complexity of our DNA indicates that it started evolving about 7.5 BYA.
Where exactly is this information from? That would just mean the methods to calculate this are probably not very precise.