This paper addresses the question of how older people can be supported to actively self-manage their own process of ageing such that overall wellbeing is achieved and maintained for as long as possible. Starting from a resource-based approach, a new theory of selfmanagement of wellbeing (SMW theory) is proposed, and it is shown how it can be used as a basis for the design of self-management interventions for ageing successfully. The main aspects of the theory, i.e. six key self-management abilities and the core dimensions of wellbeing, are presented as well as the theory-based ‘blueprint’ for the design of interventions. Empirical results of two intervention studies are briefly presented and show that the SMW theory may be a useful tool for the design and evaluation of interventions for successful ageing.