The Office of Service Learning and Science Unit at Lingnan University partnered with the Discovery and Education Department at Ocean Park (an aquatic theme park in Hong Kong) to develop a service learning project. Beyond service learning's traditional goals (enhanced student learning, useful service for a community partner), we examined the potential to develop intergenerational harmony. A service-learning project is a compulsory part of the science course CLD9008 Life Sciences: The Way Life Works, taught by Professor Jonathan Fong, Assistant Professor in the Lingnan University Science Unit. This course brings together traditional university students and elderly students from Lingnan University Elderly Academy Program directed by the Lingnan Institute of Further Education (LIFE). The elders are Hong Kong citizens aged 55 or above who voluntarily attend lectures and lessons with the students. In their service-learning project, they join intergenerational teams to transmit their new knowledge and educate Ocean Park visitors. The educational services (narration services at exhibits and assistance with interactive games) aim to fulfil Ocean Park's goal of enriching visitor experience, as well as promote awareness of marine conservation and sustainability. This study looks at on how including elders in a service-learning project facilitates open communication and reciprocal learning between age groups, and promotes intergenerational harmony. The authors wish to express their appreciation to Alan Wong and Orlando Chan from Ocean Park, Hong Kong for supporting this study.