BrainAgeMS - a Comparative Study of Brain Aging in Healthy and Patients With Multiple Sclerosis

Inclusion Criteria: Informed Consent signed by the subject * Group 1: Any healthy individual between 18 and 65 years of age * Group 2: Any individuals with any diagnosis of Multiple Sclerosis between 18 and 65 years of age and EDSS ≤6.0. Exclusion Criteria: * Group 1 and 2: Any other neurological disease except primary headaches: insufficient language skills in German or French; pregnancy, lactation, any contraindication for MRI (active implants, passive ferromagnetic implants, passive non-ferromagnetic metallic implants \>4cm in the region covered by the active RF coils, large tattoos inside a region covered by the active radiofrequency (RF) coils, claustrophobia or suspected/known non-compliance), smoking within the last 10 years prior recruitment, any other drug consumption except moderate alcohol intake (less than a standard drink containing 10 grams of alcohol per day) or use of medical cannabis, any previous head trauma (with known/suspected intracranial consequences), Body Mass Index (BMI) \>30, and any other chronic progressive disease. * Specific Criteria for group 1: The calculated biological age (BioAge R Package algorithm) differs by \> -8/+1 years from the chronological age. These patients will not be further invited for a study visit with clinical examination and MRI. * Specific Criteria for group 2: EDSS \> 6.0 as this impacts physical testing; clinical relapse within the last 6 months