This research addresses the social exclusion of elderly citizens in terms of lifelong education via an interdisciplinary STEAM (science, technology, engineering, arts, and mathematics) approach. Technological literacy among older people is a critical factor in social exclusion. This study seeks to provide senior citizens with competencies in scientific, artistic, mathematical, and technological domains by enhancing scientific and technological literacy. The research developed a series of non-formal education sessions on the golden ratio using a STEAM educational approach. A quantitative methodology approach was carried out by using a diagnostic survey of the participants’ conceptions and a subsequent quasi-experimental study to evaluate the impact of the intervention. This study, conducted with 37 senior citizens (n = 37), found positive results aligning with the existing literature on the potential of the STEAM approach. The STEAM approach proved to be engaging for seniors, offering a holistic and interdisciplinary educational experience. Despite the limited availability of science educational programs for seniors and the scarcity of studies on lifelong learning using the STEAM approach, this research highlights the need for such initiatives, especially given the growing senior population. Applying STEAM education shows promise in enhancing scientific literacy and motivation among adult learners. By integrating mathematical concepts, such as the golden ratio, with practical applications in arts and natural sciences, STEAM education can provide a rich, motivating, and accessible learning experience, promoting active and healthy ageing through lifelong learning. Further research and development in this area could maximise educational benefits for the senior population.

Museums and science centers play a leading role in non-formal education, inspiring visitors and raising social, political, and environmental awareness. These are powerful educational institutions, as they gather the infrastructure and competencies to provide opportunities to address topics related to science, technology, society, and arts, among others, through a non-traditional lens. Moreover, their projects and activities can be tailored to meet the needs and expectations of both families and schools, which makes them flexible engagement platforms for many audiences. In this chapter, the authors present an example of how the Natural History and Science Museum of the University of Porto is exploring the links between nature and mathematics in its educational programs. Taking advantage of this authentic context, an interdisciplinary educational activity was designed and implemented as part of the museum's holiday program. In it, 6- to 12-year-old children are challenged to observe and creatively interact with collections and exhibitions.