Deterioration of olfaction is a common phenomenon observed in the senior population. A number of factors may cause this deficit including infections, aging and neurodegenerative diseases. The aim of this study was to evaluate the reliability of the self-report as a measure of olfactory function in seniors. A total of 93 community-dwelling participants (43 men and 50 women) from the Quebec NuAge cohort on Nutrition and Successful Aging participated in the Olfactory Response and Cognition in Aging (ORCA) study. The age range was 80-95 years and all subjects had a telephone mini mental state examination (t-MMSE) score > 18. Individuals were interviewed using a self-report ("do you suffer from smell problems?") and quantitative (University of Pennsylvania Smelling Identification Test (UPSIT)) olfactory tests. Based on the self-report, 81% of the participants claimed to have a normal sense of olfaction. However, based on the UPSIT, 95% of them showed different forms of microsmia. These results reveal that most senior citizens are unaware of their olfactory dysfunction and indicate that an self-report questionnaire is not a valid instrument to assess olfactory function in the aging population.