Final answer:
The primary developmental task of young adults aged 18 to 25, according to Erikson's psychosocial theory, is intimacy versus isolation, where the challenge is to form strong intimate relationships after achieving a sense of self in adolescence.
Step-by-step explanation:
Erikson's Psychosocial Theory of Development
Erik Erikson's psychosocial theory outlines eight stages of development through an individual's lifetime, highlighting the major tasks we encounter in each period. Specifically, for young adults aged 18 to 25, the primary developmental task is intimacy versus isolation. This stage focuses on the formation of intimate relationships with others, building upon the sense of self developed during adolescence. Mastery of this task leads to strong relationships and a healthy personality, while failure may result in loneliness and emotional isolation.
Other stages of development, according to Erikson's theory, include trust versus mistrust in infancy, industry versus inferiority during childhood, generativity versus stagnation in middle adulthood, and integrity versus despair in late adulthood, each with its specific challenges and conflicts.
Erikson believed that achieving a positive outcome in each stage contributes to a well-rounded and resilient personality, and assists an individual in managing the complexities of social relationships throughout life.