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Introduction: obstructive sleep apnea hypopnea syndrome (OSAHS) is a common but often under diagnosed disease among elderly persons. The aim of our study was to determine the clinical and polygraphic characteristics of OSAHS in elderly by comparing them to younger patients., Methods: a retrospective study was performed at Pavillon D pneumology at Abderrahmen Mami Hospital in Ariana including 222 patients with OSAHS, divided into two groups: group 1 including 72 patients aged 18 to 45 years and Group 2 including 150 patients aged 65 and over. Clinical and polygraphic data was collected., Results: elderly patients were more female, less exposed to tobacco but more exposed to biomass smoke. The average consultation time was significantly longer for elderly patients compared to young patients. Diurnal fatigue and memory impairment were more observed in elderly patients. Asthma, hypothyroidism, diabetes, dyslipidemia, hypertension and atrial fibrillation were most commonly observed in elderly patients. Pauses in airflow and tonsillary hypertrophy were less observed in this group. There was no significant difference in OSAHS severity between the 2 groups. Logistic regression analysis showed that elderly apneic patients were more likely to be female, to have more memory impairment and to have more comorbidities with HTA, atrial fibrillation, diabetes and hypothyroidism., Conclusion: the frequency of cardiovascular, metabolic and cognitive comorbidities requires sleep investigation in apneic elderly subject, whether the clinical presentation is typical or not., Competing Interests: Les auteurs ne déclarent aucun conflit d´intérêts., (Copyright: Imen Sahnoun et al.)