Willie Nelson, who will turn 81 years old today, was presented with his fifth-degree black belt by Korean martial arts instructor Gong Kwon Yu Sol recently.

Nelson told People that he has been practicing for decades. He is a member of numerous musical hall of fame inductions and has recorded over 60 studio albums. He’s also been featured in over 30 films and TV shows.

So, the next time you try to pick a fight with an 80-year-old, remember he might be a trained martial artist.