WellnessLink is an innovative eldercare system combining a smart wristband and Artificial Intelligence (AI) technology, designed to enhance health management, psychological support, and social participation for seniors. Utilizing IoT technology, WellnessLink monitors real-time health data such as heart rate and blood pressure, and triggers emergency assistance when abnormalities are detected. The AI assistant, "Ale," provides emotional support through intelligent conversations to alleviate loneliness. Additionally, the system includes a learning module to help seniors improve their digital skills and encourages participation in community activities. WellnessLink not only improves the quality of life for the elderly but also contributes to the sustainable development of an age-friendly society.