When should people be considered an adult?

People should be considered an adult when they are 21years old. When you are 21 people respect you and think of you as mature. You are able to drive and drink. You also have to pay taxes for the jobs you have and what you do. If you are any younger then this your brain is still processing the new habits and environments so it is harder to call you an adult. When you are 21 you are usually almost out of school and know how repose the importance. Guidelines have been forgotten and you have to remember your status. Even in ambiguous situations, you know what is due. In all, I believe 21 is an reasonable age, due to the drinking age and your stages in life.