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The big bang had no centre, strange as that may seem. At any point in the universe now you would see the rest of the universe expanding away from you, so any point might seem like 'the centre'.QuaziWashboard said:Which stars would be the oldest then? Would it be the ones that formed nearest the centre of the area where the big bang occured or the ones further out in space?
When the big bang occurred, that point was the entire universe.
So the oldest stars are just the ones that happen to be oldest now. (The lifetime of a star depends on its mass - very massive stars burn out relatively quickly, while dwarf stars go on almost for ever. Google on Hertsprung-Russell diagram for more info.)