Final answer:
In late adulthood, starting in the mid-60s until the end of life, individuals engage in Erikson's 'integrity versus despair' stage where they may experience regret or satisfaction based on their life's accomplishments or missed opportunities.
Step-by-step explanation:
According to Erik Erikson's eight stages of psychosocial development, the stage where individuals tend to reflect on their achievements and might experience feelings of despair or regret about unaccomplished goals is known as integrity versus despair. This occurs during late adulthood which begins in the mid-60s and lasts until the end of life. In this phase, individuals assess their past and either achieve a sense of fulfillment and integrity, feeling content with their life's accomplishments, or they may be plagued by regret and despair over missed opportunities and unresolved aspirations. The ability to look back on one's life with a sense of accomplishment leads to well-being, whereas a focus on the 'should haves' and 'could haves' can result in bitterness and a sense of failure.