I feel like teenagers learn more from their peers because all adults really do is tell you what to do and what is right and what is wrong. But when you are with your peers you can see and learn from the choices they make. For example, if you are at school and a kid is on their phone the teacher might take their phone and send them to the office.
That might teach you to listen in class and do not be on your phone in class. On the other hand if you are at home and you are on your phone then your parent tells you to get off your phone you don't answer but then you finally listen. You won't learn anything from that because you parent is not teaching you anything they just are talking something away. So that is why I think teenagers learn from their peers than from adults.