A brief general overview of the area is followed by a detailed consideration of dementia in the context of developmental disability, including cause, diagnosis, assessment and natural history, with case examples. The next chapters concentrate on two of the most high-profile of all the major groups of developmental disabilities, with their own unique patterns of ageing: Down syndrome and cerebral palsy. Other less common causal syndromes, and their characteristics with ageing, are then reviewed. This is followed by a detailed guide to drug treatment issues in this group. The final chapter considers wider issues of psychosocial intervention and life planning for the ageing individual with developmental disability.