"Providing information to cancer patients is crucial within cancer care. As the Internet is becoming an increasingly valuable source of cancer information, it is important to consider the rapidly aging population when designing online cancer materials. Yet, the lack of studies and inconsistent findings with regard to how online information can be optimally presented to older populations call for theory-based research. This dissertation provides insight into (1) the effects of illustrations and videos on older adults' website satisfaction and recall of online cancer information, (2) the underlying processes explaining those relationships, and (3) the role of age and age-related factors in this regard. The studies discussed in this dissertation deepen our understanding of how to present online cancer materials in such a way that older patients can effectively process cancer information from the Internet."--Samenvatting auteur.