The aim of the project is to research the generational friendliness of a city using the city of Wiener Neustadt as a model from the perspective of both young students and older adults. A participatory and action-oriented citizen science (CS) approach will be used to generate knowledge about opportunities and barriers with regard to a generation-friendly city, while research will also be used to intervene and develop a toolkit for a generation-friendly Wiener Neustadt and teaching materials for schools on sustainable use together with the city's various stakeholders. Research will not be conducted on young people and older people, but together with them as citizen scientists as an intergenerational research process.