Actors real life ages
Johnny Lawrence - 56
Terry Silver - 59
Daniel LaRusso - 60
John Kreese - 75
Funny that Silver is supposed to be Kreese's peer when he's actually played by a guy younger than Ralph Macchio.
Thomas Ian Griffith, who plays Silver, is actually the most legitimate martial artist in the cast. He has been a black belt in Taekwondo for over 40 years, and does most of his own stunts in the show because he's better than the stuntmen. William Zabka, who plays Johnny, is a second degree green belt in Tang Soo Do Karate (which is the actual real life style Cobra Kai is based on); about halfway to a black belt. He was also an accomplished folkstyle wrestler in high school. The kid who plays Hawk is a purple belt in karate and also trains muay thai and BJJ. And the kid who plays Robby grew up in Taekwondo and had been training muay thai for 8 months when he got the audition for Cobra Kai.
Macchio to this day has no actual experience or skills.
Martin Kove, who plays Kreese, seems to actually be a badass as well. He's a black belt in a traditional Okinawan style of Karate called Te and has also studied Taekwondo, Kendo, Shotokan Karate, and Shaolin Kung Fu among others.