Final answer:
Erik Erikson's eighth stage of psychosocial development is Ego Integrity vs. Despair, occurring in late adulthood starting around age 65, where individuals reflect on their life achievements.
Step-by-step explanation:
The basic idea and timeframe of Erik Erikson's eighth stage of psychosocial development is Ego Integrity vs. Despair (late adulthood, starting around age 65). This stage is characterized by individuals reflecting on their lives and feeling either a sense of accomplishment and integrity or a sense of regret and despair. Those who feel a sense of integrity feel proud of their accomplishments and can look back on their lives with few regrets. Conversely, those who experience despair may feel that their life has been wasted and may face the end of their lives with feelings of bitterness and depression. Erikson's theory emphasizes that achieving competence in each stage of development leads to a healthy personality.