If time travel is possible, which I think it is, it means that every single moment in time is existing simultaneously. For example, when people travel on vacation, the place they are coming from and the place they are going to both exist at the same time. So if we apply that to time travel it means that every moment in time to infinitum of the universe is existing at once. George Washington is alive, you are not born, you are alive, and you are dead. Understand?