When you act on impulse you aren't thinking clearly. Your judgement is clouded by the emotion you are feeling in the moment. After you act on your impulse you may feel deep regret for something you may have said or done. You could hurt yourself and others. So you would want to undo your poor actions.
I disagree because if you are allowed to go serve in the military at 18 without parent permission then someone at the age 18 should be allowed to drink