The term "grown-up" refers to a person who has reached adulthood, typically defined as being 18 years or older. This stage in life is characterized by greater independence and responsibility, including financial independence, making one's own decisions, and taking care of oneself without the need for parental guidance. A grown-up may have completed their education, established a career, and developed their own personal values and beliefs. The term can also be used to describe someone who has matured emotionally or mentally beyond what is typically expected of an individual at their age.