"So if I go back in time and kill my grandfather, what happens?" "He beats you senseless, I suspect."
― Harry and Vadderung (The Dresden Files)
"Even his experience doesn't compare to mine."
― Chiyo to Sakura Haruno (Naruto)
"You're a million years too young to challenge me."
― Tsuru (One Piece)
"You're really going to let a little old woman go out and fight monsters!?" "Why should we care what happens to a bunch of monsters?"
― Mightily Oats and Mob (Carpe Jugulum)
"You are not young. But with age comes wisdom."
― Ting Wang (Johnny English Reborn)
"Dead almost 20 years, you're still taking me to school..."
― Tony Stark on his father, Howard Stark (Iron Man 2)
"I was fifteen years old when I embarked on my first campaign. For fifty years have I wandered from battlefield to battlefield, glaive in hand and smeared with dirt and blood. Even now in the Qin Army, I hold the longest service record amongst all its old Generals. Not a bad run if I say so myself."
― Chou Tou (Kingdom)
"Warriors who don't fight will die, those who let themselves rust with time are cowards."
The user has great status both mentally and physically despite their old age either from years of training or off the fly making their opponents often underestimate them as well and they make it appear as if time has had no effect on their physical condition making them a force to be reckoned with. Some users have great intellect and are capable of being master strategists as well.
Maz Koshia (The Legend of Zelda: Breath of the Wild)
Nakmor Drack (Mass Effect)
Urdnot Wrex (Mass Effect)
Matriarch Benezia (Mass Effect)
Big Boss (Metal Gear)
Liquid Ocelot (Metal Gear)
Old Snake (Metal Gear)
Revolver Ocelot (Metal Gear)
Johnny Cage (Mortal Kombat)
Sindel (Mortal Kombat)
Muramasa (Ninja Gaiden)
Reinhardt Wilhelm (Overwatch)
Jack Morrison/Soldier: 76 (Overwatch)
Ana Amari (Overwatch)
Anton Herzen (Professor Layton)
Great Shinobi Owl (Sekiro: Shadows Die Twice)
Isshin Ashina (Sekiro: Shadows Die Twice)
Lady Butterfly (Sekiro: Shadows Die Twice)
Octavio (Sly 3: Honor Among Theieves)
Master Zik (Sonic Lost World)
Cap'n Cuttlefish (Splatoon)
DJ Octavio (Splatoon)
Gen (Street Fighter series)
Gouken (Street Fighter IV)
Rowen Ilbert (Tales of Xillia)
Heihachi Mishima (Tekken)
Jinpachi Mishima (Tekken)
Shun Di (Virtua Fighter)
Montolio Debrouchee/Mooshie (Forgotten Realms)
Maria Calavera (RWBY)
Dr. Charles Gears (SCP Foundation)
Despite his advanced age, Genryūsai Shigekuni Yamamoto (Bleach) was considered to be the strongest Soul Reaper in existence for the last millennium.
Ichibē Hyōsube (Bleach) is one of the oldest Soul Reapers, possibly older than even Yamamoto, and is also one of the strongest beings in existence.
Yhwach (Bleach) is the first and most powerful Quincy to have ever existed.
Though not as powerful as he was in his prime, even in old age, Demon King Piccolo (Dragon Ball) wielded frightening power, easily outmatching skilled martial arts like Son Goku and beating him to the point where his heart temporarily stopped.
Despite his advanced age, Master Muten Roshi (Dragon Ball series) is a very skilled and experienced warrior...
... enough to earn the respect of the God of Destruction.
King Bradley/Wrath (Fullmetal Alchemist) was a very powerful swordsman despite his body often feeling the effects of old age.
Umibozu (Gintama) may be past his youth, but he retains the tremendous combat prowess enough to be regarded as the strongest in the universe, that even Utsuro respects.
Master Son (Gintama) remained in the battlefield for over two centuries, due to his mastery of Qi Gong.
Walter C. Dornez (Hellsing)
Aged 120, Isaac Netero (Hunter × Hunter) can fight toe-to-toe with the strongest Chimera Ant Meruem.
Zeno Zoldyck (Hunter × Hunter) attempts to assassinate the Phantom Troupe's leader, Chrollo.
Hagoromo Ōtsutsuki, the Sage of Six Paths (Naruto)
Tsunade (Naruto) appears to be a young woman, but she is already in her 50s, using her superhuman strength and a transformation technique to mask her physical appearance.
Despite being 91-years-old, Kakuzu (Naruto Shippuden) is one of the most powerful and dangerous member of the Akatsuki.
Aged 65, Mifune (Naruto) is the Samurai General of the Land of Iron and one of its greatest swordsman.
Despite his old age, Edward "Whitebeard" Newgate (One Piece) was still considered one of the most powerful men in the world before his death.
At the age of 68, Charlotte "Big Mom" Linlin (One Piece) is one of the four most powerful pirates in the world.
Brook (One Piece) is a veteran 90-year-old pirate and a master Gentle Blade Style swordsman.
Marine Admirals (One Piece)
While in his late 50s, Kizaru (One Piece) is an extremely powerful Marine Admiral.
At age 70, Lao G (One Piece) is a powerful grandmaster of the Earth Sage Fist and one of the strongest executives of the Donquixote Pirates.
Despite being a blind elderly man, Fujitora (One Piece) is an extremely powerful Marine Admiral.
Despite being in his 70s, Monkey D. Garp (One Piece) is still considered one of the strongest marines alive...
..., defeating legendary figures like Don Chinjao, a 500,000,000 million bounty pirate with nothing but his fist...
Kureha (One Piece) is a genius doctor who has lived up to the age of 141.
While over 70 years old, "Dark King" Silvers Rayleigh (One Piece) is still one of the strongest people in the world...
Despite being nearly 80 years old, Sengoku "The Buddha" (One Piece) was a Fleet Admiral of the Marines and one of, if not the strongest amongst their ranks, able to even battle the Blackbeard Pirates by himself.
Though elderly, Nekomamushi and Inuarashi (One Piece) are the strongest of the Mink tribe.
All Minks (One Piece) are natural-born fighter who retain their physical prowess even in old age.
Even at age 56, Ashura Doji (One Piece) is still one of the most powerful samurais of Wano.
Fukurojuku (One Piece) is the elderly captain of the Orochi Oniwanbanshu, the most elite squad of ninjas in the Wano Country.
Despite being elderly, Hayato Fūrinji (History's Strongest Disciple Kenichi) is a powerful martial artist in prime condition.
Cologne (Ranma ½) looks like a deformed she-gnome measures her age in centuries rather than years, and can still beat down any two of the teenage martial artists at the same time.
Happosai (Ranma ½) one of the two by-far most skilled characters in the series, and likely easily the most powerful chi-user.
Though not as powerful as she was in her prime, Genkai (Yu Yu Hakusho) remains a formidable fighter.
Despite his old age, Bang/Silverfang (One-Punch Man) is ranked 3rd among the strongest of the Hero Association and founder of his own brand of martial arts.
In his life as a Human in his sixties, Uraltugo Noi Nueph (Magi The Labyrinth of Magic) is a genius master magician and one of the three Magis of Alma Torran.
Even at age 69, Joseph Joestar (JoJo's Bizarre Adventures Part III Stardust Crusaders) is still a capable fighter, able to hold his own against most Stand Users.
Even at the elderly age of 87, Vasco Strada (Highschool DxD) is still one of the most powerful Exorcists of the Church.
A genuine warrior who wielded both podao and swords at the very front lines during the time of King Sho's era and armed with far more military experience than anyone in the entire courts of Qin, Shou Bun Kun (Kingdom) is one of the state of Qin's oldest veterans as he serves as a trusted advisory to Ei Sei, the 31st king of Qin and a somewhat guide/father figure to the young general, Ri Shin.
One of the greatest military figures of King Sho's era, Ou Ki (Kingdom) was a Great General of Heavens who achieved victories that numbered in the tens of thousands against many formidable foes which earned him the nickname of the Monstrous Bird of Qin due to the way he would swoop in and decimated his opponents...
...and became a living legend in his mid-50s as the last surviving member of the Six Great Generals, the six most dangerous generals within the state of Qin.
A Great General of Heavens who displayed the physical prowess worthy of the title, Duke Hyou (Kingdom) was the State of Qin's greatest Instinctual-type warrior as well as the oldest.
Geki Shin (Kingdom)
The last surviving member of the previous generation of Zhao's Three Great Heavens, Ren Pa (Kingdom) is a man recognized by all of China as one of the greatest warriors of King Sho's era of warfare...
...and as a Great General of the Heavens who holds the power of 100 men.
Ban You (Kingdom)
With his knowledge of warfare being so great that he was said to be capable of serving as a head of military affairs, Gen Pou (Kingdom) was an elite strategist and the oldest member of Ren Pa's Four Heavenly Kings who served with the Great General the longest as well as the one who taught him everything he knows about military tactics and strategical warfare.
Mou Gou, Haku Rou (Kingdom)
One of the most experienced commanders in the entire State of Qin, Chou Tou (Kingdom) was also the oldest generals in the Qin Army, having served in the military since the age of 15.
The King of 50 Mountain Tribes, Ordo (Kingdom) is one of the oldest and most powerful Great Generals for the state of Yan as he stood alongside famous figures like Geki Shin, the Savior of the Yan Kingdom and the Military God, Gaku Ki.
The oldest and the last surviving member of the previous generation of the Wei Fire Dragons, Gai Mou the Raging Bull (Kingdom) is one of the State of Wei's strongest warriors,...
...having taken the heads of over a hundred enemy generals and thousands of their soldiers.
Having served in the northern Ganmon stronghold on the Zhao/Xiongnu border for over a decade, Ba Nan Ji the Demon of Ganmon (Kingdom) is one of the State of Zhao's strongest and oldest warriors as he serves as Ri Boku's right-hand man/deputy.
The Right Hand of Ou Sen, A Kou (Kingdom) serves as the 1st commander of the Ou Sen Army as well as being one of the oldest living generals within the army.
The former deputy and Right Hand Man of Rin Shou Jo of Zhao's previous generation of the Three Great Heavens, Gyou' Un (Kingdom) represented over a decade of Zhao martial prowess and served as one of the oldest Instinctual-type warriors.
Known as the Left Hand and Shield of Rin Shou Jo, Chou Ga Ryuu (Kingdom) was one of the state of Zhao's most talented commanders as well as the oldest having served as one of best tacticians during King Sho's era of warfare.
Ko Chou (Kingdom)
With a body of that a pro wrestler, Go-Gun Hee (Solo Leveling) is S-rank among S-ranks of South Korea and the current of the Korean Hunters Association.
Master Hades (Fairy Tail) is one of the oldest and most powerful wizards to have ever lived in Earthland.
August (Fairy Tail) is one of the oldest and most powerful member of the Spriggan 12.
While he's gotten old, Georg Carmine (How a Realist Hero Rebuilt the Kingdom) is still one of the strongest (if not the strongest) in the Elfrieden Kingdom. Even opening his eyes is overwhelming.
Despite being 66, Judge Dredd (2000 AD) is a legendary lawman and Judge in both in Mega City and the Waste.
The Avatars of the past (Avatar:The Last Airbender/Legend of Korra) .
While he was in his 90s, Bumi (Avatar: The Last Airbender) was one of the greatest Earthbending masters in the entire world.
Iroh, the Dragon of the West (Avatar: The Last Airbender) earned his honorary title for his ability to breathe fire, and his claims of slaying the last dragon.
The White Lotus Order (Avatar:The Last Airbender)
Though not as powerful as she was in her prime, Toph Beifong (Avatar: The Last Airbender/The Legend of Korra) remains a powerful Earthbender, easily defeating the teenage Korra in a sparring match.
Max Tennyson (Ben 10) was a semi-retired legendary Magister rank Plumber and is the mentor of Ben, Gwen, Kevin, and the Plumbers' Helpers. Max is widely considered the greatest Plumber in the Milky Way.
Hex (Ben 10), a master magician at age 62.
Though he retired from crimefighting for 20 years and suffered from advanced age and a heart condition, the Bruce Wayne of the DCAU (Batman Beyond) retains a measure of his old crimefighting skills, once helping his protégé and son Terry McGinnis fight off a gang of Jokerz with relative ease.
The Hateocracy (The Boondocks)
Vlad Masters/Plasmius (Danny Phantom)
Being around 60 years old, Slade Wilson/Deathstroke (DC Comics) is considered one of the world's greatest mercenary of all time due to a failed medical experiment he had volunteered for when he joined the military.
Superman (DC Comics)
The Batman of Earth-31 (DC Comics) remains a talented fighter despite being 55 years old and being out of the game for ten years.
One of the oldest and strongest Viltrumite in the galaxy, Conquest (Image Comics) represented over a millennium of the Viltrumite's violent and vicious nature.
Uncle Chan (Jackie Chan Adventures)
Master Yoda (Star Wars) was considered to be one of the most skilled users of the Force in the universe.
Aged 115, Albus Dumbledore (Harry Potter) was considered one of the greatest and most powerful wizards to have ever lived.
Mr. Miyagi (The Karate Kid)
Despite being a ninety-year-old (Marvel Cinematic Universe)…
…Stick is an extremely strong martial arts master, with physical abilities completely untarnished by old age.
Madame Gao (Marvel Cinematic Universe) is a four-hundred-year-old master strategist and a martial art master.
Oogway (Kung Fu Panda)
While 900 years old, Yoda (Star Wars) was considered to be one of the most skilled users of the Force in the universe.
Even being over 80 years old, Darth Sidious (Star Wars) was one of the most powerful Dark Side practitioners to have ever lived.
Luke Skywalker (Star Wars) was one of the most powerful Force users ever.
While physically frail due to his advanced age and injuries, Snoke (Star Wars) was nonetheless very powerful in the Dark Side.
After millennia of imprisonment, the Asgardian Goddess of Death, Hela (Marvel Cinematic Universe) remains one of the most powerful beings in the Nine Realms, able to slay the entire Einherjar army of Asgard by herself.
At age 67, Nick Fury (Marvel Cinematic Universe) is the world's greatest spy as the Director of Shield.
Lord Voldermort's (Harry Potter) skills, knowledge, and power only grew with age, making him one of the most powerful Dark Wizards of all time.
While over 60 years old, Bobby Singer (Supernatural) was one of the world's greatest hunters that ever lived, having taught younger hunters everything they know in hunting, killing, capturing monsters, killed countless supernatural beings twice as strong as him, and served as a mentor/father figure to the Winchester Brothers.
Grandma and Grandpa Longneck (The Land Before Time)