Mature adults comprise more than half of the UK higher education student population, indicating significant growth in participation opportunities. However, this expansion has not necessarily resulted in equal educational quality and outcomes for adult learners. This study addresses the research gap regarding the availability and quality of support systems for mature students within Russell Group Universities (RGUs), a select group of 24 research-intensive institutions in the UK. We conducted a systematic review of 24 university websites and relevant literature from 2000 to 2023. Findings revealed that RGUs primarily offer support to mature students in finance, social integration, caring responsibilities, and academic skills. A mismatch is found between the support provided and the needs of mature students in terms of financial support eligibility criteria. The research contributes by providing recommendations for universities and policymakers to develop more inclusive strategies to support mature students in the UK and similar worldwide contexts.