The best time to be born
I think the best time to be born is right before the end of the world. You would know all that had happened before you. You might or might not have the most advanced technology humankind can manage, but you would be able to marvel at them. You would know all the heroes and villains in history, and the story of the world. You would be able to participate in the story in a meaningful by virtue of being at the end of it all. If I were born at the end of the world, I suppose I would be somewhat nostalgic, but knowing having a conclusion is much more satisfying than the unknowns that come with being between the beginning and the end.