Needed skills

When you are growing up, you experience the new skills. You start thinking in the different way and you cover an opportunity to debate. You are excited with your new ideas and verbal skills. But sometimes it brings you to discussion or even arguing. The positive outcome of it depends on your skills. Even if you find out that your opponent has wrong ideas, you should remember that you ague to come to the solution, but not for understanding who is a real winner. It is better to point it out at the beginning in order to avoid misunderstanding later, when are too hot to set the rules. Remember that now your organism is working full-strength and sometimes you are not able to control your emotions. Also, you can define the problem first to understand each other better.
So, be respectful towards your opponent (no matter, a friend of the same age or an adult person). It is better to work out assertive behavior. It means that you have to keep an adequate line between your passive and aggressive position. Being passive, you aren't able to debate. Being too aggressive, you are risky to place yourself in a bad light. Try to make your tone calm, do not try to blame or offend your partner. At least, you do not fight for the place under the sun; you just wish to come to the certain conclusion.
Again, the situation could be different as well. Aggressive opponent is worthy being teased or wittily criticized to calm him/her down and return to the adequate way of discussing.
These tips are advised for every person, no matter what the age is and can be found in any rhetoric or psychology manual.