Abstract
Concepts from the logic of modalities are applied to the life cycle to elaborate a new theory of adult and late-life development. Logical modalities involve what kind of truth a proposition or experience possesses. Four logical modalities are described, each governing discrete periods of life, both cognitively and emotionally. It is hypothesized that optimal development in adult life includes explicit awareness of these modalities and that such awareness is a feature of ‘wisdom’ in later life.

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