This thesis is the first to develop brand age (i.e., brand youthfulness and brand matureness) as a brand personality characteristic. It extends research on the effects of brand design elements to an underdeveloped domain by exploring how brand design elements (logo shape, type font, hue, and saturation) shape consumers’ brand age perceptions. Findings demonstrate that round logo shapes and type fonts, and green hue increase perceived brand youthfulness, whereas angular logo shapes and type fonts, and brown hue enhance perceived brand matureness. This research further examines the role of brand-product category congruence and finds that congruence in terms of age perceptions leads to positive brand evaluations. From a managerial perspective, this research provides guidelines to help marketers modify brand designs for achieving desired brand age perceptions and subsequent consumer responses.