Legally, you become an adult when you reach the age of majority. This is typically 18, but internationally ranges from 15 to 21 depending on your jurisdiction. You. The typical age of attaining legal adulthood is 18, although definition may vary by legal rights, country, and psychological development. According to the US government, a child officially becomes an adult when he According to the latest research, the human brain does not fully. If you're considering becoming an emancipated minor, there are several legal and In short, becoming an emancipated minor means that you are considered an adult You can also legally live on your own and do other things, like rent an.