The aim of this project was the development of a brochure, with recommendations on the topic of age-appropriate design of mobile applications. It is aimed not only at people who commission, design or develop applications, but also those who are interested in age-appropriate mobile applications.The brochure focuses on ten areas for age-appropriate application design. For each area, principles are formulated that are important for the design of applications for this target group. In addition, concrete checklists with recommendations for implementation are offered. The principles are primarily addressed to clients of mobile applications, while specialists from the application development in the checklists find concrete advice on age-appropriate design.