Final answer:
The stage of Erikson's theory that occurs during middle adulthood is generativity versus stagnation.
Step-by-step explanation:
The stage of Erikson's theory that occurs during middle adulthood, around 65 years, is called generativity versus stagnation. During this stage, individuals are focused on finding their life's work, contributing to the development of others, and making a positive impact on society. Those who successfully achieve generativity experience a sense of fulfillment and productivity, while those who fail to do so may experience feelings of stagnation and dissatisfaction.