Participatory design (PD) is a meaningful approach to involve older adults into design; however, currently we lack understanding how to do such work online. In our paper, we report from a study where we organized 19 PD workshops online with older adults. We argue that to do so in a meaningful way, a mutually shaped understanding of older adults' digital ecologies is at the core of organizing such PD processes. We present an empirical account of how digital ecologies of our older participants

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... e become an issue to tackle in the online PD workshops. Further, we provide a solution, a mapping technique, and report from our efforts to evaluate it, that should help to overcome the situation when digital ecologies become a problem in PD online.