Trending Mens New Hairstyle 2021 Boy - New hairstyles are always coming up, but most men still prefer to maintain their usual ones but with a modern touch so as to keep up with the times. Teen boy haircuts range from long to short, contemporary to classic, and punk to preppy. Mens New Hairstyle 2021 Boy : So, if you're after a new colour, try opting for a striking (yet handsomely subtle!) grey hue.