Children and adolescents have always been an important part of the future of society and the country. Often, the urban environment is subordinated and adapted to families with children, with playgrounds and infrastructure. However, the desire of adolescents to be out in society, in public spaces and to participate in social interaction is not sufficiently supported. Public space is a 'stage' for adolescents to test themselves, their limits and learn social skills, as well as to explore the norms of society and community. The aim of this article is to provide an insight into the principles of designing environments that are suitable for adolescents, with recommendations for the design process of such public outdoor spaces. Analysing publicly available information on the needs of adolescents and the suitability of outdoor spaces for their outdoor activities, it emerges that often the adaptation of urban environments for children or adults contributes to the isolation of adolescents from society, which in turn results in gatherings in unsuitable areas, vandalism and substance abuse. Introducing with suitable case studies in the design of outdoor spaces for adolescent children, we conclude that in order to mitigate the above risks, it is necessary to understand the developmental processes, emotional and psychological characteristics of adolescents, as well as to raise awareness of the basic principles of democratic upbringing in society, and to develop guidelines for the involvement of adolescents in urban planning, which would help municipalities to involve this specific target group in urban planning, ensuring that adequate public spaces are created for adolescents.