You actually have many higher selves. The higher self is just one more more cognizant self, that has not yet expanded into All That Is. It is "you from the future" working out its development in the only way it can at its level -- by fine tuning it's aspects in the past, so as to result in a optimal state of energy balance in the "future" (state of development, not to be confused with linear "time"). And to answer the question, I think there is a fairly large difference between the 5 years from now higher self, and the one I speak of. The one I speak of is not physically incarnate, but still constantly communicating with such incarnated personality gestalts. So it is not limited by so called "earthly knowledge limits".