Old Master / Western Animation

• Avatar: The Last Airbender:
  • Avatar: The Last Airbender: King Bumi, Uncle Iroh, Jeong Jeong, Master Pakku and Monk Gyatso are all prime examples of this trope, each being one of the most powerful of their respective elemental bending discipline (Iroh and Bumi make heavy use of Obfuscating Stupidity as well). Although never seen in combat, Monk Gyatso qualifies because of the amount of dead Firebenders surrounding his corpse, which he fought during Sozin's comet. Whether or not Piandao counts is based solely on how old you think he is. In the Grand Finale, King Bumi, Uncle Iroh, Jeong Jeong, Master Pakku and Piandao all show up and take back Ba Sing Se themselves. For bonus points, the episode in which we see them is actually named "The Old Masters".
  • The Legend of Korra:
    • In the Sequel Series, Katara becomes this when she's seen as a member of the Order of the White Lotus. That, and she's also Korra's Waterbending teacher.
    • Zuko and Toph also became Old Masters by the time of Korra, with Zuko taking an active role in caging Zaheer and the other Red Lotus members (and can hold his own in a fight against them) and Toph being able to curbstomp Korra and Kuvira's army with just a few basic Earthbending moves. Toph in particular, with her journey to find herself, can likely lay claim to being the greatest Earthbender who ever lived.
• DC Animated Universe:
  • Bruce Wayne from Batman Beyond is definitely an example of this trope. Stooped over and forced to rely on a cane to help him walk, he still stares daggers through anyone who would presume to show him his place, and is more than capable of beating the holy howling tar out of an entire motorcycle gang by himself, standing almost completely still, with nothing but his cane. This plus his still-razor-sharp mind and the experience of his years as the original Batman makes him somehow more intimidating than when he was in his physical prime. This is proven in an episode where his younger self visits the future, forcing Batman to play good cop to Old Man Wayne.
    Old Man Wayne: I can't believe I was ever that green. [he grabs the thug away from Batman] This is how you interrogate someone!
    [cut to the gang member telling the Old Man everything up to and including that he wet the bed until he was a teenager]
  • Another example in the DC Animated Universe, much earlier on, is Batman's own master; Yoru Sensei, who quickly immobilizes Kyodai Ken, just shortly after Kyodai beat Bruce Wayne in a sparring match. Given that Kyodai was less than half Yoru Sensei's age, and Yoru Sensei himself looks like the man in the example picture, he definitely qualifies.
• Spoofed in the George of the Jungle episode "Still Got It", in the form of Grouch-Mouth. He's an elderly tiger who gets picked on at first but," You're forgeting that Ol' Grouch-Mouth is the king of the pranks." He then gets in his scooter and goes on a pranking rampage, until the now-decrepit "Mighty Berment" (who originally defeated him) arrives. The two fight. While the fight was anticlimactic, it turns out the two are old friends and join forces to show how pranks are really done. They go on an even bigger pranking rampage. George ends up sending Berments Wife, Mighty Mary, to save the day and the two pranksters leave.
• The Hollow: The Last Ironwood Tree has shades of this. Besides being an incredibly old and wise being, she is also the only inhabitant of the Hollow who actually helps the kids by providing them advice, directions and determining if they're already worthy to face Colrath.
• Uncle in Jackie Chan Adventures. Not only is he an expert Martial Artist, but also one of the most powerful Chi Wizards in the world, helping his nephew save the world on a regular basis with his extensive magic.
  Uncle: You want a piece of UNCLE???
• Jasmine Lee in The Life and Times of Juniper Lee is the protagonist's grandma (called "Ah Mah", literally grandma in pin yin) and the previous mantle bearer of the Te Xuan Ze role. Having at least sixty years of fighting experience under her belt, she trains Juniper in being a better protector and guardian. Even though she experiences some backlash from her age, she still manages to wipe the floor, whether the enemy is a huge monster or an army of magically-enhanced magic-hating humans.
• Mrs. Twombly in Littlest Pet Shop (2012) was a master (and the founder) of kung-fu quilting until a Career-Ending Injury in 1969. (The series is set in the present.) She eventually recovered and kept her skills sharp in private but chose to permanently retire, having turned to teaching upon request.
• Sensei Wu in Ninjago. He can beat up attackers with just an old bamboo staff despite his old age. Not to mention that he knows spinjitsu better than just about anybody.
  Sensei Wu: [to Kai] You are not ready to face my pinky toe!

• A very dark example in Star Wars Rebels when Ezra meets a mysterious fellow who wants to be called "Old Master". That fellow is Darth Maul, and he's as strong as ever.
• In the Stargate Infinity episode "Stones", the crew met a race of squirrel people. To cross a bridge a kindly old man requests that one of the team fight him. When the Action Girl, stating that she'll 'take it easy on the old geezer' tries and gets her ass handed to her, the team leader quips:
  "Now you know why I didn't fight him. When a guy's standing on a bridge itching for a fight, you figure he knows something you don't."
• In Teen Titans there was the True Master (named Chu Hui in the end credits) a rare female example of this trope. Her habit of giving answers that had simple meanings when people expected complicated ones was very similar to Mr. Miyagi's habit of doing so.
• Scavenger in Transformers: Armada. Not only is he the kind of fighter badass enough to catch a blow from an unstoppably powerful sword with his arm, but he makes a pretty good double agent.
• Master Fung of Xiaolin Showdown is a classic example, being an actual Chinese monk. Not only is he filled with wisdom (And the cheesy sayings that come with it), he's also a force to be reckoned with when he fights, taking on several of Chase Young's tiger minions at once and winning, and in one instance, fighting Chase and Wuya in a wheelchair and holding his own. However, due to his age, he doesn't quite have the energy to keep it up...