Aim: To identify and describe key service components that should be incorporated into age-appropriate integrated mental health care for young adults aged 18-24 years.Methods: Key service components were identified through a mixed-methods approach including targeted examinations of the literature and structured discussions with experts in youth mental health.Results: Seven key components were identified as important for providing ageappropriate mental health care to young adults. Two were classified as clinical service components (structured psychological therapies; care coordination and liaison), three were classified as non-clinical service components (vocational support; youth development; peer support) and two as integrated non-clinical and clinical service components (lifestyle interventions and family and network support). Example service models for each of these key service components were identified and described.Conclusions: This is the first study to identify and describe key service components for age-appropriate mental health care for young adults. The findings provide mental health service planners with a framework of services that should be considered when planning and resourcing services for this age range.