ARE you the same person now that you were fifteen years ago? In fact, are you the same person you were just seven years ago? Most of us have heard the old saying that every cell in the body is changed over a period of seven years; but recent investigation has uncovered facts of far more significance to us as human beings. This concerns the emotional, physical and mental changes that seem to occur in approximate seven-year intervals. Of course there are no fixed boundaries and so one may achieve these levels of maturity at any period of our life. so what follows are simply the general changes you may find.