The goal of this observational study is to learn how reliable the DiaMem memory assessment tool is when used repeatedly over a short period. The main question it aims to answer is:

• How consistent are the DiaMem test scores when the same person takes the test multiple times?

Researchers will also compare DiaMem with another digital memory test called MemTrax to gather initial information.

Participants will:

• Be adults aged 60 or older.
• Complete a standard memory test and a thinking skills test.
• Be randomly split into two groups (A and B).
• Take memory tests once a day for 6 days in a row.

Group A will take the DiaMem test 3 times first, then the MemTrax test 3 times.

Group B will take the tests in the opposite order.

• Answer a short questionnaire about how easy the tests were to use.

Inclusion Criteria:

-Age ≥ 60 years, regardless of gender. Willing and able to provide signed informed consent.

Exclusion Criteria:

• Corrected visual acuity insufficient to see text/images on a mobile phone screen.
• Corrected hearing inability to hear prompts at the phone's maximum volume. Severe upper limb dysfunction (e.g., severe arthritis, Parkinson's tremor) preventing stable phone operation.
• Does not own a smartphone, or owns one that cannot properly run WeChat mini-programs.
• History of severe mental illness (e.g., major depressive disorder, bipolar disorder, schizophrenia).
• History of long-term alcohol or substance abuse.
• Hospitalization, emergency visit, or major life event (e.g., myocardial infarction, marriage/divorce, fall) within the past month.
• Use of antipsychotics, antidepressants, antiepileptics, sedatives, or plans to use them within the next two weeks.
• Planned travel (e.g., inter-city) or other major arrangements likely to interrupt study participation within the next two weeks.

The study will enroll a community-based sample of 30 older adults aged 60 years and above. Participants will be stratified by age into three groups (60-69, 70-79, and ≥80 years) to ensure representation across older age ranges. While the primary focus is on validating a measurement tool and not on treating a specific disease, the sample may include individuals with subjective memory complaints or varying cognitive abilities as typically found in a community setting, provided they meet all eligibility criteria.

Individual participant data (IPD) that will be shared include all study-collected, de-identified individual-level data necessary to reproduce the primary and secondary outcomes reported in future publications. This specifically encompasses:

Participant Baseline Characteristics: Age group, sex, and education level.

Assessment Scores:

For the DiaMem tool: Total score, immediate memory score, and delayed memory score for each of the three sessions.

For the MemTrax tool: Accuracy rate and average response time for each of the three sessions.

Usability Data: System Usability Scale (SUS) score for each tool.

Administrative Data: Actual completion time for each assessment session, and the assigned study group (A or B).

Data will be rigorously de-identified. All direct personal identifiers (e.g., name, contact information, initials, specific birth dates) will be removed. Participants will only be referenced by a unique, anonymized study ID.