2012 Teen Hairstyles and Hair Trends. For 2012, many teens may want to try a new look or hairstyle for the new year. Some might even be willing to cut off all of their hair with a trendy new haircut. If you're one of the many teens that wants something new and interesting for 2012, we've got you covered. As we step into the new 2012 hair season, all of the latest trends are based off what celebs are wearing at the time, as well as runway inspired looks. From hair knots, to slicked back hair and edgy bob cuts, there are quite a few new styles to rock. Look below to see pictures of the latest 2012 teen hair trends.