Final answer:
Antisocial personality disorder (ASPD) can occur in individuals below the age of 18, although it is more commonly diagnosed in adults. Childhood adversity and antisocial behaviors in children can increase the risk of developing ASPD later in life.
Step-by-step explanation:
Antisocial personality disorder (ASPD) is a mental health disorder characterized by a disregard for the rights of others and a persistent pattern of violating societal norms. Based on research, it is possible for individuals below the age of 18 to have ASPD, although the diagnosis is typically not made until adulthood. Several studies have found that ASPD can be present in adolescence and even childhood, but it is more commonly diagnosed in adults.
For example, a study by Afifi et al. (2010) found that childhood adversity was associated with an increased risk of developing personality disorders, including ASPD, later in life. Another study by Marshal and Molina (2006) found that antisocial behaviors in children with ADHD can moderate the pathway to substance use.
While it is possible for individuals under 18 to have ASPD, it is important to note that a proper diagnosis can only be made by a qualified mental health professional.