Is 18 still a teenager and adult?

Yes, 18 is considered the age when a person transitions from being a teenager to an adult in many cultures, as it is often the legal age for various adult rights and responsibilities. However, some may still view 18-year-olds as teenagers due to their youth and ongoing development. Socially and psychologically, many 18-year-olds continue to experience aspects of adolescence while also taking on adult roles. Thus, they can be seen as straddling both categories.