The selection of floors and furniture in offices can impact the interior environment and potentially influence employees’ emotions and health. This study aims to investigate the effects of floor material, furniture color, and age on design evaluation, fixation duration, and time to first fixation. Twenty-four younger adults (M = 21.9, SD = 1.75) and twenty-four older adults (M = 48.1, SD = 6.85) participated in the experiment, where they viewed four different designs: wood floor—brown furniture (WF-BF), wood floor—dark furniture (WF-DF), tile floor—brown furniture (TF-BF), and tile floor—dark furniture (TF-DF). Participants also evaluated the designs and their emotions. Results showed the main effects and interactions of floor material, furniture color, and age. WF-BF performed the best in design evaluation, fixation duration, and time to first fixation, and also scored highest in joy, admiration, fascination, and desire. Older adults favored the texture of wood, while younger adults showed better acceptance of TF-DF. This study provides insights for interior design in office environments.