Background: The life expectancy of people with intellectual disabilities has increased. The implications of ageing have resulted in changes in their support needs and challenges to support staff. Access to evidence based strategies for support staff providing care to elderly with intellectual disabilities remains scarce. A systematic review was conducted to provide an overview of available psychosocial interventions. Methods: Four databases were searched and assessed according to the PRISMA guidelines. A narrative, integrative method of analysis was conducted to synthesise quantitative and qualitative data. Results: The 36 studies included in the review reported on interventions aimed at either identifying and meeting the needs or perceptions of older individuals or at improving their behaviour and skills. Furthermore, the role of support staff in the implementation of interventions was either active, assisting or undefined. Conclusions: This overview of studies could contribute to the existing body of knowledge and help to optimise psychosocial support for a growing population.