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You build a device that can travel at near light speed and attach to it one one end of your wormhole.
Then you find a naturally occurring wormhole to the very distant past and send it through. It will come out light-years from Earth and billions of years in the past. It spends much of that time speeding towards Earth, then waits for the desired age to occur.
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Belive it or not, I was going to say that.