What signifies the transition into late adulthood developmentally?

The transition into late adulthood is closely associated with retirement and reflection. This stage of life typically involves significant changes, such as stepping away from one's career, which shifts the focus from work-related responsibilities to personal interests, hobbies, and spending time with family and friends.

Retirement marks a pivotal moment; it often provides individuals with the opportunity to reflect on their life experiences, evaluate their achievements, and consider their legacy. This period can lead to a renewed sense of purpose as individuals engage in activities they may have postponed during their working years. The emphasis on reflection allows for personal growth and a deeper understanding of one's life journey.

The other options, including marriage and family, starting a career, and peer relationships, while important aspects of human development, do not specifically signify the transition into late adulthood. Marriage and family are often more pronounced in earlier developmental stages, starting a career pertains to young adulthood, and peer relationships evolve throughout life but do not uniquely define the transition into late adulthood.