Based on the theory of care, this paper examines the interface design of smart travel applications in the digital era and proposes design strategies that integrate both humanistic care and technological inclusivity. Using grounded theory as the research approach, interviews and observations of older adults have been conducted, and a relational construction model has been established through coding analysis. First, the contextual associations of older adults with travel apps were analyzed; second, various factors influencing their use were identified; and finally, four distinct but interrelated design strategies were proposed: interface usability, relationship connection, value reconstruction, and identity recognition. This study extends beyond the limitations of traditional usability paradigms by adding a relational perspective, asserting that older adults are not isolated or defective users of digital technology but rather valuable subjects who possess rich relational resources in intergenerational and peer-group networks. Therefore, the design of smart travel applications from a relational perspective can effectively meet the travel needs of older adults.
