An overview of the experimental literature on ageing and cognition in the areas of sensation and perception, attention and performance, learning and memory, and intelligence and problem solving is provided. The review indicates definite deficits in most functions, and therefore provides a basis for understanding the origin of the stereotypes of the elderly as senile, obsolete, and useless. However, when viewed in a broad, integrated perspective, there seems to be grounds for a less pessimistic outlook than most people have. The most positive findings are some recent ones in the area of memory, which show that the elderly are able to make use of the knowledge they have accumulated over a lifetime to perform some tasks as good as or better than younger adults. Some researchers have begun to lay plans for the development of intervention programmes for the elderly, and we suggest some areas which may be profitable for further development. There are, however, some difficult motivational issues that need to be dealt with. It seems that many elderly persons claim to be functioning to their own satisfaction, from a cognitive perspective.