This article examines the extent and the meaning of solitude among the aged. A comprehensive study of the foreign, Canadian and Quebec literature was undertaken to prepare this document, but priority was given to the somewhat lesser known investigations originating from Quebec. First, the concepts most often utilized in discussing the phenomena under scrutiny were defined: solitude, social isolation and the feeling of loneliness. Then, the relative importance of each phenomenon was assessed, based on the available data. In order to fully understand the meaning of the facts observed, their causes were also examined. Finally, avenues for future research were proposed. This study suggests that solitude among the elderly is a more complex problem than believed. Even if the isolated and (or) lonely aged are in the minority, this does not mean that all their socio-affective needs are being met. These people spend long periods of time alone and this affects their lives. The problem as such is largely caused by the position the elderly occupy in the society and, in turn, this position probably influences their behaviour. However, gerontologists have scarcely studied this hypothesis. This article then highlights certain aspects of the solitude phenomenon which have so far been overlooked by gerontologists.