The document discusses resilience from a developmental perspective across the lifespan. It describes four waves of resilience research including identifying individual resilience factors, embedding resilience in developmental systems, intervening to foster resilience, and examining multi-system levels. For each life stage - infancy, childhood, adolescence, adulthood, and old age - factors affecting resilience are discussed, such as parent-child relationships, social support systems, and adaptive coping strategies. Resilience is framed as positive adaptation despite challenges or threats at different stages of life.