The objective of our research was to complete the profile of the Czech elderly as potential users of the cognitive training applications delivered by the interactive digital television broadcasting. The characteristics of users were captured using the personas' approach, a method that reflects empirical data and that can be taken into account in the process of ambient intelligence and smart home applications development. Personas were built on questionnaires' data and structured interviews. In the later phase of the project, several psychological tests were used for the verification and evaluation of the prototypes of cognitive training applications. Therefore we were interested how results of these tests correspond with personas' descriptions. In the paper we present the overview of personas' approach and of standardized psychological tests used in the scope of our project and we discuss the possibility of reusing data from these tests in the process of completing personas, i.e. for better understanding of needs, requirements and expectations of future customers of software products and services.