There is a large amount of cross-sectional evidence for a midlife low in the life cycle of human happiness and well-being (a ‘U shape’). Yet no genuinely longitudinal inquiry has uncovered evidence for a U-shaped pattern. Thus some researchers believe the U is a statistical artefact. We...

Objective - Although human aging is characterized by loss of fertility and progressive decline in physical abilities, later life is associated with better psychological health and well-being. Furthermore, there has been an unprecedented increase in average lifespan over the past century without...