Sniff and sweat: new study tests simple ways to keep aging brains sharp

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria * Adults aged ≥60 years under the care of Primary Care and/or the Geriatrics Service of the Hospital Universitario de Navarra; * Normal cognitive function as determined at baseline assessment (Mini-Mental State Examination \[MMSE\] score ≥23; ≥21 for individuals without formal education); * Fluent in speaking, reading, and understanding Spanish; * Adequate olfactory function; * Adequate visual and auditory acuity to complete neuropsychological and computerized assessments; * In good general health, with no condition expected to interfere with study participation; * Willing and able to comply with study procedures and to participate for the entire study duration; * Willing to refrain from the use of scented candles, essential oils, or air fresheners during study participation. Exclusion Criteria * Refusal or inability of the participant, primary caregiver, or legal representative to provide informed consent; * Diagnosis of a neurodegenerative disease or severe dementia (Global Deterioration Scale \[GDS\] stage 6-7); * Conditions affecting the olfactory system (e.g., nasal polyps); * Life expectancy \<3 months; * History of asthma, allergies, or olfactory-triggered responses producing allergy-like symptoms (e.g., rhinorrhea, lacrimation, sneezing, or skin rash); * History of neurological disorders such as Parkinson's disease, multiple sclerosis, brain cyst, tumor, or aneurysm; * Significant medical conditions, including uncontrolled diabetes mellitus, uncontrolled hypertension, nutritional deficiencies, or thyroid disorders; * History of major psychiatric disorders such as schizophrenia, bipolar disorder, anxiety disorders, or attention-deficit/hyperactivity disorder; * History of alcohol or substance abuse or dependence within the past 2 years (DSM-IV criteria), including use of cigarettes, e-cigarettes, cigars, marijuana, or any substance that may produce odors interfering with the study.