Final answer:
Middle adulthood is a stage of life that lasts from the mid-30s to the mid-60s. It involves forming new relationships with adult children and caring for aging parents and adult children, known as the Sandwich Generation.
Step-by-step explanation:
Middle adulthood is a stage of life that typically lasts from the mid-30s to the mid-60s. During this time, individuals may experience various changes and challenges. One characteristic related to middle adulthood is the "Launching Children and Moving On" stage, where adults form new relationships with or through their adult children. Another characteristic is being part of the "Sandwich Generation," which involves the responsibility of caring for both aging parents and adult children.