If we truly want to live well beyond sixties, we must move forward in terms of public policy. Public policy, based on the multicentric vision, is understood as an intention to solve public problems, and its protagonist actor is a state or nonstate legal personality. Therefore, the public policies formulation is not exclusive to the State. They focus on solving complex social problems (e.g. longevity with quality) and can therefore be addressed by all society levels. We start from the assumption that the design has instruments that can help the public sector to solve complex social problems related to the longevity. This study was developed with the objective of identifying how the design process can constitute a way for the elaboration of public policies for the population aged from 60 to over. The place of study is the Third Age of Living Center (TALC - Barreiro) in Belo Horizonte city. Methodologically, our study was guided by the action-research added to the process of participatory design (cocreation) and its tools. We conclude that the design as a field of social character knowledge, multidisciplinary, transdisciplinary vocation and intangible planner can provide forms to improve public policies formulation in different ways, such: (i) Including the people affected by the problem in all stages of the process who are positioned as co-creators favoring more active participation; (ii) Through the construction of skills in a diverse audience favoring the potential of each without hierarchy; (iii) Through the visual language contributing to make the process less arduous and more affectionate; (iv) As a facilitator of interactions to create systems that contribute to the connection between the sectors of society; (v) Through the legacy left in the institutions and participants that we must all be co-responsible.