Existing research indicates that Social Network Systems (SNSs) are a potential way to overcome the social isolation of older adults (OAs). With this in mind, we developed a mobile-based social volunteering network system called GoldenJubilants, taking a user-centred approach. This system connects OAs with volunteer opportunities in the community. The objective of the study presented in this paper is to assess the perceived usability of this newly developed system, focusing particularly on different types of OAs. We employed a mixed method approach with a convenience sample of OAs aged over 55, living in Ireland. The System Usability Scale (SUS) survey was used to test the usability of our system, while semi-structured interviews were conducted to identify suggestions for future improvements. Early results indicate a high level of usability with a suggestion of long-term uptake of this system. Although these preliminary results are based on a small sample, there was a consensus across all participants with a small standard deviation across the results. Thus, our study has proved useful for understanding the level of usability of GoldenJubilants from the lens of OAs. It has also helped to highlight where improvements are required. These findings can guide the designers of SNSs for OAs to create systems that meets their needs, which will in turn have a higher likelihood of being used in practice.