Dementia represents a growing global public health challenge, driving the rapid expansion of educational interventions aimed at improving awareness and promoting risk-reduction behaviours. Despite this growth, existing research demonstrates a persistent gap between knowledge acquisition and meaningful behavioural change. This paper presents a realist-informed conceptual analysis and proposes an integrative conceptual framework for evaluating the real-world effectiveness of digital dementia education. Integrating health literacy theory, the Capability–Opportunity–Motivation Behaviour (COM-B) model, and implementation science, the framework conceptualises dementia education as a dynamic, multi-component process involving resource availability, user engagement, interpretative engagement, behavioural readiness, contextual influences, and real-world outcomes. Particular emphasis is placed on interpretative engagement, grounded in constructivist and sensemaking perspectives, as a key mechanism linking exposure to educational content with behavioural intention and action. The paper identifies critical limitations in current evaluation approaches, including overreliance on knowledge-based outcomes and insufficient consideration of contextual, emotional, and implementation influences. By advancing a user-centred and context-sensitive framework, this study contributes to the development of more theoretically informed and implementation-oriented approaches for evaluating digital dementia risk-reduction education, particularly among midlife populations.