The article presents the original method of longevity loop in response to challenges faced by modern cities, such as ageing societies and increasing diversity of lifestyles. It aims to demonstrate how interdisciplinary and participatory design of spaces, products and services can realistically facilitate longevity, and improve quality of life. The method is based on three pillars: social (social life cycle), environmental (life cycle assessment) and economical (life cycle costing), through the stages of recognising lifestyles, determining the changeable needs over the users’ life cycle, constant improvement of solutions in urban planning and architecture. Experience of implementing designs in Polish cities – such as 15-minute city in Pleszew and revitalisations in Wrocław and Kraków – as well as observations of European practices show that effective design is not only a matter of tools, but mostly of readiness for critical evaluation, openness to dialogue with residents, and constant improvement of solutions. The originality of this development relies on combining academic reflection with practical guidelines and a checklist, which support the process of regular upgrade of urban space. The article offers a new outlook on the role of lifestyles, changeable needs over the users’ life cycle, and co-responsibility for building cities that actually promote longevity.
Keywords: city, longevity, circular design, lifestyles, participation