This study explores the key considerations in designing a smart environment for the elderly, aiming to enhance their effective use of such space environments within a structure such as a building. A survey was conducted among a limited sample of elderly recipients in South Korea to explore the relationship between the frequency and usefulness of smart digitalization usage and various factors, including design elements, age, and perceived necessity. By identifying the needs of modern elderly people regarding smart environments, the study aims to provide implications for the direction of smart environments for the elderly, thereby contributing to the creation of a sustainable society in various ways. The study results are as follows. First, in terms of design factors, eco-friendliness was identified as a major factor influencing both the frequency of use and the convenience of the elderly in smart environments. Second, the age group of the elderly was found to be a significant variable affecting the frequency of use and the convenience of smart environments. Third, variables such as an emergency environment, a comfortable environment, and a healthy environment with regard to environmental factors, as well as maintenance, aesthetics, and safety in design elements, were found to have no statistically significant impact. These findings suggest that simply considering environmental friendliness or aesthetics is insufficient in designing a smart residential environment for the elderly, and that design strategies prioritizing the actual user experience and convenience are necessary.