SHE WOULD be approaching middle age now. Perhaps with children, maybe grandchildren. Instead, she is a question mark. Deanie Peters was just 14-years-old when she vanished on Feb. 5, 1981. Friends and family recently remembered the pretty brunette on what would have been her 45th birthday. In her honor, they gathered in Grand Rapids, Michigan and released 45 white balloons. Each of the ballons had her picture on it. Her former boyfriend Rob Mackey was 