With elderly people becoming an ever larger part of our society, the usability of modern technical products for these people is becoming an ever more important issue. Instructions that optimally fit the needs of this elderly audience could enhance the usability of the products they belong to. The study described in this article is aimed at an investigation of this gerontological research literature to find out what is already known about age deficiencies in cognitive processes which might adversely influence instructional text processing. On the basis of the findings from this research, tentative guidelines could be given on how such manuals could be designed and written. Moreover, we propose several kinds of follow-up research that still have to be carried out to gather more knowledge on the topic of manuals for the elderly.