Adolescents think in terms of ideals. Problem is that they don't have much experience. Adolescents tend to substitute ideals for experience. Ideals are different from reality because they are conflict free. Extremely rigid, unbinding set of ideal - cults, or merely totally dropping out.
Work is now crucial.
Spend most of life preparing for this stage, end of life recovering from it. Rejectivity - don't care for specific groups. Ego Integrity vs. despair. With wisdom, can accept death as the completion of life. Grandchildren listen to grandparents tell stories.