Final answer:
In Erik Erikson's psychosocial theory, the stage of 'intimacy versus isolation' occurs in early adulthood, approximately the 20s through early 40s. Older individuals in late adulthood, from mid-60s to the end of life, face the challenge of 'integrity versus despair,' reflecting on their life's achievements.
Step-by-step explanation:
According to Erik Erikson's psychosocial theory of personality, the phase of life in which people go through the psychosocial stage of "intimacy versus isolation" is early adulthood, which is during the 20s through early 40s. In this stage, after developing a sense of self in adolescence, individuals are ready to form intimate relationships with others. Erikson theorized that a strong sense of self is a prerequisite for these relationships, and those who do not develop this may face loneliness and emotional isolation.
The challenge that older people struggle with according to Erikson's theory occurs in late adulthood, which is the period from the mid-60s to the end of life. The task at this stage is characterized as integrity versus despair, where individuals reflect on their life accomplishments and either achieve a sense of satisfaction and integrity or face regrets and despair.
In the context of Erik Erikson's stages of psychosocial development, it's important to note that each life phase has a distinct challenge. The developmental task of adolescence is finding one's identity, while in middle adulthood, the focus shifts to generativity versus stagnation, where adults seek a sense of productivity and connection to others through contributions to society.