Processing speed is measured with the Digit Symbol Coding subtest from the WAIS-III. It consists of replacing symbols that lack verbal meaning with numbers based on a key. Higher scores indicate better outcomes.

Visual scanning and processing speed are measured with the Trail-Making Test-A version. Participants are asked to connect a series of numbered circles on a page in numerical order. Higher scores mean a better outcome.

Executive functioning and cognitive flexibility are measured with the Trail-Making Test-B version. Participants are asked to connect a series of circles that contain both numbers and letters in alternating numerical and alphabetical order. Higher scores mean a better outcome.

Executive functioning is assessed with the Modified Wisconsin Card Sorting Test (M-WCST), which evaluates abstract reasoning, cognitive flexibility, and the ability to shift problem-solving strategies. Performance is scored based on the number of categories completed, total errors, and perseverative errors. Higher scores in perseverative errors indicate worse performance, while more categories completed reflect better executive functioning.

Selective attention, inhibition, and processing speed are measured with the Stroop Color and Word Test. Participants are asked to name the color of a series of color patches (Stroop Color Naming), read a series of color words (Stroop Word Reading), and name the color of a series of color words where the word and color do not match (e.g., the word "red" written in blue ink), Stroop Color-Word Interference. Higher scores mean a better outcome.

Phonemic verbal fluency is assessed using the PMR test, in which participants are asked to produce as many words as possible beginning with the letters P, M, and R, one minute per letter. The total score is the sum of all correct, non-repeated words across the three trials. Higher scores indicate better phonemic fluency and executive function.

Semantic verbal fluency is assessed with a category fluency task in which participants are asked to name as many words as possible belonging to a specific semantic category (e.g., animals, fruits) within one minute. The total score is the number of correct, non-repeated words produced. Higher scores indicate better semantic fluency and lexical access.

Language function is assessed using the 15-item version of the Boston Naming Test (BNT), a confrontation naming task consisting of 15 black-and-white line drawings of objects with increasing difficulty. The total score is the number of correctly named items. Higher scores indicate better naming ability.

Loneliness levels are measured through the UCLA Loneliness Scale, a widely recognized tool for measuring subjective feelings of loneliness or social isolation. The most recent version, contains 20 items rated on a scale from 1 (Never) to 4 (Always). Higher scores indicate worse outcomes.

Perceived social support is measured with the Oslo 3-Item Social Support Scale (OSLO-3). The OSLO-3 is a brief measure of perceived social support, consisting of three items assessing the number of close confidants, perceived concern from others, and ease of obtaining practical help. Scores range from 3 to 14, with higher scores indicating greater perceived social support.

Emotional well-being is measured with the WHO-Five Wellbeing Index Scale (WHO-5). The WHO-5 is a brief self-reported measure of current mental well-being, consisting of five positively worded items. Each item is rated on a 6-point Likert scale, resulting in a raw score ranging from 0 to 25. The score is multiplied by 4 to yield a final score ranging from 0 to 100, where higher scores indicate better well-being.

Depression is measured with the Patient Health Questionnaire-9 (PHQ-9) which scores each of the 9 DSM-IV criteria as "not at all" (0 points) to "nearly every day" (3 points). Higher scores mean a worse outcome.

Anxiety is measured with the 7-item Generalized Anxiety Disorder Scale (GAD-7), a Likert-type scale with questions ranging from "not at all" (0 points) to "nearly every day" (3 points). The maximum score is 24. Higher scores mean a worse outcome.

Frailty is measured with the FRAIL scale. The FRAIL Scale is a 5-item screening tool that assesses frailty based on fatigue, resistance, ambulation, illnesses, and loss of weight. Each item is scored as 0 (no) or 1 (yes), with total scores ranging from 0 to 5. Higher scores indicate greater levels of frailty.

Dietary haabits are measured with the PREDIMED questionnaire (adherence to the Mediterranean diet). The PREDIMED is a 14-item questionnaire used to assess adherence to the Mediterranean diet. Each item is scored 0 or 1 depending on dietary habits, resulting in a total score ranging from 0 to 14. Higher scores indicate greater adherence to the Mediterranean diet.

Performed physical activity is measured with The International Physical Activity Questionnaire (IPAQ) is a questionnaire composed of 7 questionsin order to assessthe frequency, duration, and intensity (vigorous or moderate) of the performed physical activity, walking, and sitting time during a business day for the last 7 days. Later, from the minutes obtained from the participant's answers, the METS (metabolic equivalent tasks) conversion is performed, allowing a classification, depending on the energy consumption obtained for each activity, into three categories (low, medium, high). Higher score indicate better outcome.

Sleep Quality is measured with The Pittsburgh Sleep Quality Index (PSQI). This test presents 24 items, although only 19 are taken into account for the correction. This test is divided into 7 dimensions, namely, sleep quality, sleep onset latency, sleep duration, sleep efficiency, sleep disturbances, hypnotic drugs, and daytime dysfunction. Higher scores indicate worse sleep quality.