This paper analyzes the results published in the literature about the physiopathology of presbycusis studied by evoked oto-acoustic emissions. Evoked oto-acoustic emissions were recorded in a group of normally hearing-subjects and a group of patients demonstrating sensorineural hearing loss due to presbycusis. Correlations studies were made between the incidence and threshold of evoked oto-acoustic emissions and (i) the age, (ii) the tonal audiometric thresholds and (iii) the speech audiometry. Complementary informations on outer hair cell degenerative changes in presbycusis could be deduced from these data.