Inclusion Criteria:  age ≥ 70 years on admission to hospital diagnosis of SARS-CoV-2 infection defined by a positive RT-PCR test medical or critical care hospitalisation between 1 July 2020 and 31 August 2021 who experienced severe hypoxaemic acute respiratory failure defined as at least 4L/min of oxygen during hospitalisation  Exclusion Criteria:  Oxygen therapy < 4L/min during hospitalisation Mc Cabe score 3 (chronic disease fatal at 1 year such as stage IV heart failure, ventilated respiratory failure, metastatic cancer, Child C cirrhosis) dementia or cognitive disorders before hospitalisation reported in the medical record patient GIR 1 to 4 before hospitalisation reported in the medical file or deduced from the description of the lifestyle patient with an ADL score < 4 before hospitalisation reported in the medical record or deduced from the description of lifestyle patient living in EHPAD before hospitalisation non-French speaking patient patient under guardianship or curatorship refusal to participate in the study for patients surviving 1 year or refusal by a family member or trusted person