Prevalence of olfactory impairment in older adults.

By C. Murphy, C. Schubert, K. Cruickshanks, Barbara E. Klein, Ronald Klein, D. Nondahl. Journal of the American Medical Association (JAMA), 2002

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Olfactory disorders and quality of life--an updated review. (2014, background): “2004), or 24% (≥53 years; Murphy et al. 2002), with highest prevalence in older men.”
Position paper on olfactory dysfunction. (2017, background): “5%, with the ability to accurately self-assess olfactory function decreasing with age (35).”
Taking the sensory approach: how individual differences in sensory perception can influence mate choice (2012, positive): “Chemical perception is altered by developmental (Bigiani et al. 2002; Bertin et al. 2012) and conditional factors such as age (Doty et al. 1984; Murphy et al. 2002) and hormone profile (De Groof et al. 2010; Maruska & Fernald 2010; Kasurak et al. 2012).”
Normative data for the “Sniffin’ Sticks” including tests of odor identification, odor discrimination, and olfactory thresholds: an upgrade based on a group of more than 3,000 subjects (2007, background): “olfactory function above the age of 55 years [28].”