Study of Functional Decline and Care Pathways in Neurosurgical Patients Over 65 Years of Age

Inclusion criteria: Age ≥ 65 years at the time of admission Admission to a neurosurgery department in one of the participating centres (France, Spain, or Portugal), Affiliation with a national health-insurance or equivalent system Feasibility of follow-up at 3 months, Consent/non-opposition for the study Exclusion Criteria: Terminal illness (neurosurgical or not) with an estimated life expectancy of \< 3 months. Loss of autonomy prior to admission, established as ADL \< 3. For a patient admitted to the emergency hospital, ask him (or his caregiver) about his functional abilities before his condition deteriorated. Legal protection status (guardianship, trusteeship, or judicial protection) when such status prevents lawful consent or non-opposition. Participation in another interventional clinical study whose procedures or follow-up could interfere with GENEUS 1 objectives or endpoints. Severe cognitive or communication impairment