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Older adults are a heterogeneous population for which many e-health innovations are inaccessible. Involving older adults in user-centered design (UCD) with a specific focus on inclusive design is important to make e-health more accessible to this user group. This case study aimed to explore the feasibility of a new UCD approach aiming to minimize bias in the design phase of a digital support for older adults’ physical activity (PA). The study used mixed methods and applied UCD principles in a four-iteration design phase followed by an evaluation phase where 11 and 15 older adults participated, respectively. The users’ gender, PA level and technology experience (TE) were considered in recruitment, data analysis and prioritization of improvement efforts. In the design phase, users with different gender, PA level and TE participated and contributed with feedback, which was prioritized in the development. The adaptation included improving readability, simplifying layout and features, clarifying structure, and making the digital content more inclusive and relevant. The evaluation showed that the users had a positive experience of the prototype and could use it with some help. The study demonstrated that adopting e-health to assure digital inclusion among older adults must address several aspects. The UCD approach was feasible for amending user bias and for confirming that users of both genders and with varied PA- and TE level shaped the design. However, evaluation of the method with larger samples is needed. Moreover, further research on methods to involve digitally excluded populations in UCD is needed.