In order to evaluate the user experience of the elderly in using mobile APPs, a user experience evaluation method of APPs for the elderly based on multi-attribute decision making of the interval numbers is proposed. Firstly, an evaluation index system of APP user experience is built for the elderly; Then, the interval analytic hierarchy method is used to analyze the weight of the user experience evaluation index of the elderly APP, and the weight value obtained is corrected. Secondly, the user experience evaluation experiment of the elderly APP was carried out. The interval score of the elderly APP under each user experience evaluation index was obtained through the user experience questionnaire. Next, the comprehensive evaluation of the elderly APP program was carried out through the interval number gray absolute correlation analysis, and the interval number gray absolute correlation degree of each scheme was obtained. Finally, the results are analyzed to summarize the design principles of user experience of APPs for the elderly. Taking the mobile medical APP as an example, the results confirm the effectiveness of the proposed method, and the evaluation using the number of intervals can fully consider the uncertainty in evaluation of the elderly, and effectively evaluate the user experience of the mobile APP for the elderly.