75 to 77 years old MS patients whose disease began at 65 years old or earlier will be retrieved from the "Observatoire français de la sclérose en plaques" (OFSEP) which includes more than 50 000 MS patients in France. Accuracy of these patients' data from 65 to 75 years old will be thereafter checked and completed in 3 French MS centers: Lyon, Rennes and Bordeaux, participating to this database directly from the patients' clinical files. From these 3 MS centers around 150 MS patients from 75 to 77 years old are expected to be analysed on site.
The data wich will be retrieved for these patients are: irreversible disability status scale progression, relapses, Magnetic Resonance Imaging (MRI) data, CSF data, Lublin classification of type of MS, McDonald 2005 and 2010 criteria, date and age at beginning of progression, characteristics and modality of relapses and clinical impairment at the beginning of the disease, treatments used, treatment failures and side effects, co morbidity, Barthel index, EuroQol-5D (EQ-5D), cognitive impairment (SDMT test), social life data and socio economic data. To the investigator's knowledge this will be the first systematic description of very old MS patients with data on long term natural history of MS and characteristics in this population of elderly MS patients.
