Introduction: Deceptive patterns manipulate users into performing unintended actions or disclosing personal information, posing particular risks to vulnerable populations. As essential services become increasingly digitized, understanding how these patterns affect different demographics is key to fostering a more ethical and inclusive internet. Objectives: To analyze how Brazilian older adults understand deceptive patterns and to evaluate the effectiveness of a self-explanatory deceptive pattern catalog as an awareness-raising tool for this demographic. Methods: A workshop was conducted with 9 older participants (aged 61–74), involving: sociodemographic and technology usage questionnaire, explanatory presentation, guided interaction with the catalog, and pre-/post-workshop surveys. Data were analyzed both quantitatively and qualitatively using Stamper’s Semiotic Framework. Results: Of the seven participants who completed the workshop, only one reported prior awareness of deceptive patterns. Post-workshop results showed increased recognition and concern, though barriers such as technical language, interface design, and unfamiliarity persisted. Conclusion: Findings suggest that the digital catalog is a promising educational tool, though accessibility improvements are needed. Future work will improve the catalog features and expand its evaluation to broader user groups.