Inclusion Criteria:  Male or female aged 65 or more Patients going to the emergency for a mild head trauma with risk of complication and treated within 3 hours of the head injury, according to the following criteria: Adult patients with head trauma presenting: Retrograde amnesia lasting more than 30 min, Or A loss of consciousness or amnesia of the facts Or Glasgow score <15 to 2 hours from traumatism Speaking and reading French Subject having expressed his non-opposition to the research or non-opposition given by a trusted person / member of his family in cases where the patient is not in a position to express his non-opposition. Subject affiliated to a social health insurance protection scheme  Exclusion Criteria:  Severe head trauma Mild head trauma without risk of complication Patient under the protection of justice Patient under guardianship, curatorship Subject in exclusion period (determined by a previous or current study)