:. P. Philadelphia, Blakiston's son & Co.; 1914. 654 p. 2. United Nations, World Populations Ageing, 2011.

A. Boumendil, P. Aegerter, B. Guidet, and C. Network, Treatment Intensity and Outcome of Patients Aged 80 and Older in Intensive Care Units: A Multicenter Matched-Cohort Study, Journal of the American Geriatrics Society, vol.357, issue.1, pp.88-93, 2005.
DOI : 10.1111/j.1532-5415.2005.53016.x

S. Oeyen, D. Vandijck, D. Benoit, L. Annemans, and J. Decruyenaere, Quality of life after intensive care: A systematic review of the literature, Critical Care Medicine, vol.38, issue.12, pp.2386-400, 2010.
DOI : 10.1097/CCM.0b013e3181f3dec5

W. Knaus, D. Wagner, J. Zimmerman, and E. Draper, Variations in Mortality and Length of Stay in Intensive Care Units, Annals of Internal Medicine, vol.118, issue.10, pp.753-61, 1993.
DOI : 10.7326/0003-4819-118-10-199305150-00001

P. Abizanda, M. López, V. García, E. J. , D. Da-silva-gonzález et al., Effects of an Oral Nutritional Supplementation Plus Physical Exercise Intervention on the Physical Function, Nutritional Status, and Quality of Life in Frail Institutionalized Older Adults: The ACTIVNES Study Longterm mortality and quality of life in intensive care patients treated for pneumonia and/or sepsis: Predictors of mortality and quality of life in patients with sepsis/pneumonia, J Am Med Dir Assoc. 2 avr J Crit Care, vol.11, issue.12, 2015.

P. Marik, Management of the critically ill geriatric patient, Critical Care Medicine, vol.34, issue.Suppl, pp.176-82, 2006.
DOI : 10.1097/01.CCM.0000232624.14883.9A

S. Inouye, P. Peduzzi, J. Robison, J. Hughes, R. Horwitz et al., Importance of Functional Measures in Predicting Mortality Among Older Hospitalized Patients, JAMA, vol.279, issue.15, pp.1187-93, 1998.
DOI : 10.1001/jama.279.15.1187

V. Pavoni, L. Gianesello, L. Paparella, L. Buoninsegni, E. Mori et al., Outcome and quality of life of elderly critically ill patients: An Italian prospective observational study, Archives of Gerontology and Geriatrics, vol.54, issue.2
DOI : 10.1016/j.archger.2011.11.013

J. Haas, C. Teixeira, C. Cabral, A. Fleig, A. Freitas et al., Factors influencing physical functional status in intensive care unit survivors two years after discharge, BMC Anesthesiology, vol.14, issue.1, pp.193-201, 2012.
DOI : 10.1186/cc8967

. Consortium, H. Van-lindert, and G. Westert, Population-based incidence, mortality and quality of life in critically ill patients treated with renal replacement therapy: a nationwide retrospective cohort study in Finnish intensive care units The health status of the Dutch population as assessed by the EQ-6D, Crit Care Lond Engl. Qual Life Res Int J Qual Life Asp Treat Care Rehabil. avr, vol.1614, issue.13, pp.655-63, 2005.

P. Merlani, C. Chenaud, N. Mariotti, B. Ricou, B. Gurkin et al., Long-term outcome of elderly patients requiring intensive care admission for abdominal pathologies: survival and quality of life Quality of life and functional level in elderly patients surviving surgical intensive care Impact of gender on treatment and outcome of ICU patients Performance of two measures of general healthrelated quality of life, the EQ-5D and the RAND-36 among critically ill patients, 530? 7. 22. Udekwu P, pp.2245-52, 2001.

D. Hennessy, K. Juzwishin, D. Yergens, T. Noseworthy, and C. Doig, Outcomes of Elderly Survivors of Intensive Care, 1764? 74. 26. Kaarlola A, Pettilä V, Kekki P. Quality of life six years after intensive care, 2005.
DOI : 10.1378/chest.127.5.1764

M. Fredrikson, M. Kristenson, S. Walther, and F. Sjöberg, Health-related quality of life scores after intensive care are almost equal to those of the normal population: a multicenter observational study, 1294? 9. 27. Orwelius L, p.236, 2003.

J. Jackson, W. Obremskey, R. Bauer, R. Greevy, B. Cotton et al., Longterm cognitive, emotional, and functional outcomes in trauma intensive care unit survivors without intracranial hemorrhage, J Trauma. janv, vol.62, issue.1, 2007.

C. Daubin, C. S. Séguin, A. Gaillard, C. Valette, X. Prévost et al., Predictors of mortality and short-term physical and cognitive dependence in critically ill persons 75 years and older: a prospective cohort study, Health and Quality of Life Outcomes, vol.9, issue.1, p.35, 2011.
DOI : 10.1097/00003246-199903000-00048

URL : https://hal.archives-ouvertes.fr/inserm-00663656

M. Garrouste-orgeas, J. Timsit, L. Montuclard, A. Colvez, O. Gattolliat et al., Decision-making process, outcome, and 1-year quality of life of octogenarians referred for intensive care unit admission Quality of life before intensive care unit admission is a predictor of survival Health-related quality of life of multiple organ dysfunction patients one year after intensive care, R78. 33. Pettilä V, pp.1473-1482, 2000.

M. Baldwin, W. Narain, H. Wunsch, N. Schluger, J. Cooke et al., A Prognostic Model for 6-Month Mortality in Elderly Survivors of Critical Illness, Chest, vol.143, issue.4, pp.910-919, 2013.
DOI : 10.1378/chest.12-1668

D. Somme, J. Maillet, M. Gisselbrecht, A. Novara, C. Ract et al., Critically ill old and the oldest-old patients in intensive care: short- and long-term outcomes, Intensive Care Medicine, vol.29, issue.12, pp.2137-2180, 2003.
DOI : 10.1007/s00134-003-1929-2

D. Rooij, S. Govers, A. Korevaar, J. Abu-hanna, A. Levi et al., Short-term and long-term mortality in very elderly patients admitted to an intensive care unit, Intensive Care Medicine, vol.301, issue.7
DOI : 10.1007/s00134-006-0171-0

D. Lown, J. Knott, T. Rechnitzer, C. S. Maclsaac, and J. Gautier, Predicting short-term and long-term mortality in elderly emergency patients admitted for intensive care, Intensive Care Med. juill Crit Care Resusc J Australas Acad Crit Care Med. mars, vol.3215, issue.71, pp.1039-1083, 2006.

G. Psychol-neuropsychiatr-vieil, J. Vincent, R. Moreno, J. Takala, S. Willatts et al., The SOFA (Sepsis-related Organ Failure Assessment) score to describe organ dysfunction/failure. On behalf of the Working Group on Sepsis-Related Problems of the European Society of Intensive Care Medicine, déc Intensive Care Med. juill, vol.1122, issue.47, pp.389-95, 1996.

L. Gall, J. Lemeshow, S. Saulnier, and F. K. , A New Simplified Acute Physiology Score (SAPS II) Based on a European/North American Multicenter Study, JAMA: The Journal of the American Medical Association, vol.270, issue.24, pp.2957-63, 1993.
DOI : 10.1001/jama.1993.03510240069035

A. Boumendil, E. Maury, R. I. Luquel, L. Offenstadt, G. Guidet et al., Prognosis of patients aged 80???years and over admitted in medical intensive care unit, Intensive Care Medicine, vol.30, issue.4, pp.34387-42647, 2004.
DOI : 10.1007/s00134-003-2150-z

S. Cohen, P. Sjokvist, M. Baras, H. Bulow, and S. Hovilehto, End-oflife practices in European intensive care units: the Ethicus Study, Compliance with triage to intensive care recommendations2132? 6. 44. Sprung CL, pp.790-797, 2001.

M. Hamel, J. Lynn, J. Teno, K. Covinsky, A. Wu et al., Age-Related Differences in Care Preferences, Treatment Decisions, and Clinical Outcomes of Seriously Ill Hospitalized Adults: Lessons from SUPPORT, Journal of the American Geriatrics Society, vol.312, issue.Suppl, 2000.
DOI : 10.1111/j.1532-5415.2000.tb03129.x

S. Karunananthan, C. Wolfson, H. Bergman, F. Béland, and D. Hogan, A multidisciplinary systematic literature review on frailty: Overview of the methodology used by the Canadian Initiative on Frailty and Aging, BMC Medical Research Methodology, vol.116, issue.1, pp.176-82, 2009.
DOI : 10.1016/j.amjmed.2003.09.031