Pediatric MS is multiple sclerosis that begins in children or teens. About 98% have relapsing-remitting MS, versus 84% of adults with MS. This means that symptoms come and go (relapse and remit). When symptoms are gone, the disease is still able to progress. According to the National Multiple Sclerosis Society (NMSS), the majority of people who have MS will experience a relatively normal life span. On average, most people with MS live about seven years less than the general population. According to the NMSS, around two-thirds of people with MS are able to walk without a wheelchair two decades after their diagnosis. Some people will need crutches or a cane to remain ambulatory.