Age-Friendly Cities and Communities (AFCC) is an approach supported by World Health Organization (WHO) that aims to develop a senior reflex in public policies by integrating the constant participation of older citizens. Age-Friendly Wallonia (AFW) is a participatory action-research project that supported the implementation of AFCC in the Walloon Region (Belgium), with financial support from the region. The work carried out with six pilot municipalities aims to eventually involve a majority of the 262 Walloon municipalities in the approach. AFW is intended to be a citizen-based approach led by, for, and with the elderly. The AFW approach is analyzed in the light of four concepts that the article examines successively, based on the experience of the elderly: otherness, appropriation, participation, and inclusion. At first, the process is foreign to the seniors. But it presents itself to them with wide margins of appropriation. The seniors adapt the process and are modified by it. Then, through the process, they find an appropriate framework for participation and contribute to changing society. By confronting all parts of the process, the seniors find paths to inclusion.