Involving end-users in the innovation process allows for the development of products and services that are best adapted to them, meeting their specific needs, and thus having a better chance of viability in a dedicated market. How to involve older adults in this process and in what ways do they specifically contribute? What are the main hurdles to overcome in these collaborations? Should older adults be involved in a different way than other consumer groups? What structures or platforms currently exist to better facilitate the co-development of innovations through testing with seniors? Are these solutions successful?