Participants receive weekly non-personalized informational messages about general healthy aging topics delivered by email during the 24-week study period. These messages provide general education but do not include personal recommendations, interactive features, or access to the Adult Wellbeing CheckUp platform.

Mental health symptoms measured using the Patient Health Questionnaire-4 (PHQ-4), a validated 4-item screening tool assessing anxiety and depression symptoms. Scores range from 0 to 12, with higher scores indicating greater symptom severity.

Physical activity level measured using the Rapid Assessment of Physical Activity (RAPA). Aerobic activity (RAPA-1) is scored based on the highest numbered activity level endorsed (1-7), classifying participants from sedentary to active. Strength and flexibility activities (RAPA-2) are recorded separately and categorized as none (0), strength only (1), flexibility only (2), or both strength and flexibility activities (3).

Emotional loneliness measured using the UCLA Loneliness Scale-3, a validated 3-item self-report scale assessing perceived loneliness and social isolation. Scores range from 3 to 9, with higher scores indicating greater loneliness.

Social isolation measured using the Lubben Social Network Scale (LSNS-6), a validated 6-item measure assessing perceived social support from family and friends. Scores range from 0 to 30, with higher scores indicating larger and more supportive social networks.

Sense of belonging and social connectedness measured using two items adapted from the Duke Social Support/Sense of Belonging questionnaire assessing frequency of contact and time spent with friends or family. The first item assesses frequency of contact with friends or family (in person, by phone, or by video) and is scored on a 5-point scale from 1 (rarely or never) to 5 (daily). The second item assesses the number of times participants spend time with someone who does not live with them in a typical week and is scored on a 4-point scale from 1 (none) to 4 (five or more times). Item scores are summed to produce a total score ranging from 2 to 9, with higher scores indicating greater social connectedness and sense of belonging.

Sleep disturbance measured using the PROMIS Sleep Disturbance Short Form (8a), an 8-item validated self-report questionnaire assessing perceived sleep quality, sleep depth, and difficulty falling or staying asleep over the past seven days. Each item is rated on a 5-point response scale. Responses are summed to produce a raw score ranging from 8 to 40. Higher T-scores indicate greater sleep disturbance.

Change in perceived impact of actions taken within prioritized wellbeing domains measured using a single-item question. Participants rate the impact of actions taken in specific domains using a numeric rating scale from 0 to 10, where 0 indicates no impact and 10 indicates very high positive impact on wellbeing. Higher scores indicate greater perceived positive impact of actions taken within the selected wellbeing domain.

Change in perceived overall impact of actions taken on wellbeing measured using a single-item question. Participants rate the overall impact of actions taken on their wellbeing using a numeric rating scale from 0 to 10, where 0 indicates no impact and 10 indicates very high positive impact on overall wellbeing. Higher scores indicate greater perceived overall benefit from actions taken.

Participant-reported barriers that may limit engagement with recommended wellbeing actions. Barriers are assessed using a survey question allowing participants to select one or more applicable options from a predefined list (e.g., time constraints, lack of resources, lack of motivation, or other challenges).

Change in caregiver burden among care partner participants measured using the 12-item Zarit Burden Interview (ZBI-12). Each item is rated on a 5-point Likert scale from 0 (never) to 4 (nearly always). Total scores range from 0 to 48, with higher scores indicating greater caregiver burden.

The first question would address whether the participant found the platform helpful and useful, and the second question would address whether the participant would desire to use the platform. Both questions are rated on a Likert scale (e.g., 1 = strongly disagree to 5 = strongly agree). Higher scores indicate greater perceived usefulness.