[[quoteright:330:[[TabletopGame/DungeonsAndDragons http://static.tvtropes.org/pmwiki/pub/images/75580_CN_CROP_GL_812.jpg]]]]
[[caption-width-right:330:Baby dragons may seem like a cute pet for your kids... But they grow up. And never stop.]]

->''"I laid low the warriors of old, and their like is not in the world today. Then I was but young and tender. Now I am old and strong, strong, strong..."''
-->-- '''Smaug the dragon''', ''Literature/TheHobbit''

Everyone knows a child is more durable than a newborn, and that an adult is tougher than a kid. However, for humans it stops there -- we might get OlderAndWiser, but from middle age onwards we begin to physically deteriorate. Some creatures... don't. They never grow decrepit. Arthritis never settles in. They keep growing stronger, faster and more resilient with each passing year, and in some cases they keep growing ''bigger'' as well. They're not simply [[OldMaster more powerful due to having more experience]]: they are literally tougher than any younger specimen of the same breed.

[[OurVampiresAreDifferent Vampires]], [[OurDragonsAreDifferent Dragons]], and [[WizardsAndWitches Wizards]] are three of the most common beings to exhibit this, with ancient dragons and elder vampires possessing terrible power, and older wizards invariably commanding greater arcane might than their younger fellows. This can cause a bit of FridgeLogic if the creature is stated not to be immortal: if dragons become more resilient as they age, then just ''how'' do they die of old age? [[FridgeBrilliance The answer could be the]] SquareCubeLaw -- [[TheAgeless except when they don't die of old age at all]].

A subtrope of OlderIsBetter. See also {{Monster Lord}}s, who are often older members of their species, and contrast EvilMakesYouMonstrous (for the latter, they get eviler with age and thus get uglier and stronger). For the human equivalent, see the OldMaster and BadassGrandpa. See also GiganticAdultsTinyBabies, MonsterProgenitor and MotherOfAThousandYoung.

[[IThoughtItMeant Not to be confused with]] what happens to certain cheeses, [[WineIsClassy wines]], and socks.



[[folder:Anime and Manga]]
* ''Anime/YuGiOh''
** Joey/Jonouchi defeats an opponent by allowing his Baby Dragon to age a millennium into the much-more-powerful Thousand Dragon.
** It's also true with Yugi's Dark/Black Magician, who becomes the Dark/Black Robed Sage after also having a thousand years to study the arts of magic.
** The Gagagigo story shows that Gagagigo became stronger when he ages. However, while Gagagigo is much stronger than his child self "Gigobyte", his cyborg version "Giga Gagagigo" was modified by Kozaky, averting this trope. "Gogiga Gagagigo" was the stronger, insane version of "Giga Gagagigo", but he eventually became the good "Gagagigo the Risen" who has the same ATK and DEF as "Gogiga Gagagigo".
* The ''Franchise/LyricalNanoha'' franchise has Voltaire, an ancient black dragon so powerful, it's practically revered as a PhysicalGod in Caro's home planet of Alzus, with Caro serving as a priestess that it [[SummonMagic occassionally lends its power to]]. In contrast, Friedrich, the young dragon that Caro raised on her own, is mainly used for support fire and transport even in his full form.
* In ''Manga/OnePiece'', Lao G practices a form of martial arts that allows him to continue to gain physical strength as he ages. Problem is that it does not prevent health problems like bad backs and arthritis, which causes the octogenarian fighter to do things like destroy mountains with a single palm thrust and then collapse in back pain.

* In ''ComicBook/KingdomCome'' Franchise/{{Superman}} is said to be undergoing this. After so many years under Earth's yellow sun, he's stronger than ever, and immune to [[KryptoniteFactor Kryptonite]].
** Creator/GrantMorrison's Superman gets more powerful over the next 80 millennia and eventually bestows powers on his descendants.
* The Maestro, the future version of the ''Comicbook/IncredibleHulk'', who is stronger and smarter than present day Hulk (even when PDH is in smart mode).
** Part of the rationale is that there had been a nuclear war, and since the Hulk is radiation-powered, this made him stronger at the expense of his sanity (well, at the expense of Smart Hulk's sanity).
* Explicitly stated to be the case with Comicbook/TheInhumans, with regards to their powers. A Kang-made Franchise/SpiderMan robot once tried to disable Crystal and Franchise/TheAvengers by rapidly aging them, only to be HoistByHisOwnPetard when Crystal suddenly had double the ElementalPowers.
* A problem to overcome in one of the ''ComicBook/{{XXXenophile}}'' comics. A human girl and a troll girl fall in love, but the troll is very strong, roughly on par with a bear, and liable to hurt the human in throes of passion. They manage by using restraints... but then the troll girl reveals that with age she'll become ''much'' stronger.
* ''ComicBook/BlackMoonChronicles'': Dragons only get bigger as they get older. The oldest dragon in the world and the progenitor of his kind is so big that he barely fits through the spacegate.

[[folder:Fan Works]]
* [[Manga/LoveHina Keitaro]] in ''[[https://www.fanfiction.net/s/5463805/6/Ancestor Ancestor]]'' makes Tsuruko realize that his immortality is why he has an immeasurable amount of ki. For ordinary people, the amount of ki they have eventually reaches a plateau as their body ages too much for their ki to keep growing. Keitaro is [[ReallySevenHundredYearsOld over 1500 years old]] and physically around 20, meaning his ki has never stopped growing.
* ''Sailor Moon: Legends of Lightstorm'': This is stated to be the case with all Sailor Scouts, thus explaining why the Silver Millennium Moon Kingdom did not value armor as much as Sailor Jupiter would have liked.
* ''FanFic/TheImmortalGame'': Applied in alicorns. Luna, the weakest of them all, is a hundred years old -- due to her being imprisoned in the moon for the past thousand years -- Terra is nine hundred years old, Celestia is more than a thousand years old, and Titan is more than THREE THOUSAND YEARS OLD, which puts him to Discord's level.
* This is a common assumption in most ''Series/BuffyTheVampireSlayer'' fan fiction. Buffy and Faith, as the oldest living Slayers are portrayed as being stronger, faster, and more durable than any of the other activated Slayers, and Buffy -- who has two years more experience than Faith as a Slayer -- is usually portrayed as having a slight edge over her counterpart.
** One ''Series/BuffyTheVampireSlayer'' story subverts this. Everyone thought the Slayer grew stronger as she aged but Willow discovers that they actually grow stronger from fighting. Buffy, who hasn't fought in over five years, has fallen to second strongest while Faith, who never stopped fighting, is a fair bit stronger than her. Several of the older Slayers are noted as only being a year or so before they outstrip Buffy as well.
* Due to his unique circumstances, Xander in ''[[http://www.tthfanfic.org/Story-31008/HeatherSin+Butterflied.htm Butterflied]]'' only becomes more dangerous as he ages. This is because he's not only TheAgeless but also gains the [[VoluntaryShapeShifting form]], [[PowerCopying skills]], and memories of anyone he has skin contact with. Over a thousand years before the Clone Wars, he accidentally copies the skills of a Jedi believed to be the greatest lightsaber user ''ever'' and only gets more skilled from there. A couple decades before the clone wars, he's shown to train facing two droids/simulators that are functionally Sith lords while in use.
* According to [[Anime/CodeGeass C.C.]] in ''[[https://www.fanfiction.net/s/6200608/1/More-than-just-a-Man More than just a Man]]'', the reason vampires get stronger with age is twofold. First, they learn new mental abilities as they age. Even at over two thousand years old, she still learns a new one every so often. Second, a vampire's HealingFactor increases as they age. Initially, they heal only slightly faster than an ordinary human but after a few centuries, they can survive their heart being impaled.

* ''Film/AnacondasTheHuntForTheBloodOrchid'' uses this to justify AttackOfTheFiftyFootWhatever: the titular snakes are stated to keep growing for their entire life, thus ones that consume [[MacGuffin blood orchids]]--flowers that can prevent aging--can grow to be much bigger than normal.
* The [[OurVampiresAreDifferent vampire]] Elders in ''Film/{{Underworld}}'' are stronger than any other vampire and, in some cases, can even defeat [[OurWerewolvesAreDifferent lycans]] in hand-to-hand combat. In a memorable example, Viktor grabs [[TheDragon Raze]] in his lycan form by the throat, holds him up for a few seconds, and then [[NeckSnap breaks his neck]]. In the case of Marcus and William, the Corvinus twins and progenitors of the vampires and lycans, respectively, they are also stronger, although this can be attributed to MonsterProgenitor. In Marcus's case, his strength is augmented tenfold after he accidentally ingests lycan blood and becomes a hybrid. William was already stronger than any other lycan. According to [[ActionGirl Selene]] in ''Film/UnderworldEvolution'', Alexander Corvinus, the original immortal and the father of the twins, is easily the strongest of them all, although he refuses to fight or otherwise make use of it.
* Franchise/{{Godzilla}}'s entire species falls under this. First, they start off as cute relatively docile creatures that can barely form nuclear smoke-rings or bubbles. However, as time progresses, they grow larger, more powerful, and are able to unleash [[BreathWeapon powerful blasts of radioactive plasma from their mouths.]]
** This is especially evident with Junior, who starts out like [[http://i1235.photobucket.com/albums/ff435/Soundpulse/Baby_Godzilla.jpg this]] and grows up into [[http://vignette4.wikia.nocookie.net/godzilla/images/e/e8/Godzilla_Jr.jpg/revision/latest?cb=20080407133825 this.]]
** Mothra Leo in the spin-off ''Mothra Trilogy'' falls under this big time. In [[Film/RebirthOfMothra3 the third film]], he travels back in time to the Mesezoic Era where ancient Mothra Larvae encase him in a cocoon for 65 million years before he [[spoiler:emerges as Light-Speed Mothra before transforming into Armor Mothra and killing the evil Grand-King Ghidorah.]] And then he [[spoiler:transforms into the immortal Eternal Mothra]] his most powerful form.
* Seemingly averted in ''Film/{{Byzantium}}''. Clara [[spoiler: is able to kill Werner with relative ease and wrestles Savella to the ground despite both being older than her (Savella having lived through the Crusades)]]. It is unknown if the vampires actually have super strength or if it's just proportional to their height and weight like humans. Though Clara being able to easily overpower men to feed on them [[spoiler: and punch through a windscreen like it was nothing]] suggests they are at least much stronger than humans.

* In ''Literature/TheZombieKnight'', [[CameBackStrong servants]] and, indirectly, [[HumanoidAbomination aberrations]]. Servants gain SoulPower steadily as they become more synchronized with their reaper, and their [[ElementalPowers ability]] will grow with practice, meditation or emergence. Aberrations grow by [[YourSoulIsMine killing humans]], so the longer that they have had to do so, the more powerful they become. The oldest and most powerful servant in the world, [[BigGood Sermung]], is over 600 years old.
* Creator/JRRTolkien
** Dragons. [[Literature/TheHobbit Smaug]] provides the page quote.
** Elves. The more they age, the [[TimeAbyss wiser]] and more powerful they are. However, it's implied that they become more 'hollowed out' by their own inner fires, and that after 1000 millennia (1,000,000 years) they may be spread thin.
* ''Literature/TheDresdenFiles''
** It's been stated that the oldest Dragon in existence is also the strongest, though it is unknown if he is merely special, or Dragons become stronger over time.
** The undead grow stronger the older the remains that went into their reanimation are. This culminates with Harry reanimating a Tyrannosaurus' skeleton. A CurbStompBattle ensued.
** [[OurVampiresAreDifferent Black Court Vampires]]. On the one hand, it is noted that since Mavra is such an old vampire she is likely to be mobile and capable of defending herself during the day where younger vamps would be forced to sleep. But then they toy with it by pointing out that the reason Black Court vamps in general are such major badass types is because of basic survival of the fittest since ''Dracula'' was published. To get to be that old, they must have been Badass to begin with, or they'd have been killed (again) years ago.
** Wizards also follow this rule - while part of it is that they learn how to more effectively use their power, even an increase of skill can't account for ALL of the tricks that more powerful wizards can pull off. Even WITHOUT the various external power boosts he gets, Harry has gained a noticeably greater degree of power over just the decade that the stories take place over; and significantly older wizards on the Council are capable of tricks Harry didn't even know were possible [[spoiler: like dropping satellites from space with pinpoint accuracy and turning into a half-dozen animals in a bout with an EldritchAbomination]]. This is aided by a wizard's slow aging and ability to eventually regenerate from even serious maiming without a build-up of scar tissue.
*** Also, Wizards minds are subject to this. The older they get, the more resistant their mind is to any type of mind control or persuasion. This little fact is used to great effect in one of the novels.
* In ''Literature/TheCinderSpires'', by the same author, core crystals conduct energy more and more efficiently as they age. Makes for a minor moment of awesome when ''Predator'' is revealed to have what may well be the oldest core crystal in the world.[[note]]A passing comment (in narration) states 'Power crystals become more efficient with age'. One of the protagonists, (whose family has work with crystals), reflects upon seeing the ''Predator'' core that crystals of that type had been shaped/cut/polished for centuries, largely as a matter of style. The one she was looking at gave the appearance of being uncut. Do the math.[[/note]]
* The [[spoiler:basilisk]] from ''Literature/HarryPotterAndTheChamberOfSecrets'' is apparently still in top form at the age of one thousand. And if the shed skins are any sign, she's still growing.
* Dragons in ''Literature/InheritanceCycle'' never stop growing, some were as big as mountains.
* The vampires in Creator/AnneRice's ''Literature/TheVampireChronicles'' books get stronger as they age. Even after doing nothing but sleeping for hundreds of years, they wake up stronger than they were before. Drinking the blood of an older, more powerful vampire can also add to their power. They also obtain new abilities with age, or "gifts" as they call them, the most common one being the Cloud Gift which enables flight. Interestingly, no vampire is ever comfortable with flying, realizing how unnatural it is (even for a vampire), except for Akasha and Lestat (who gained these abilities after drinking her blood).
* Eventually subverted in Mikhail Akhmanov's ''Literature/ArrivalsFromTheDark'' series, where the [[LizardFolk Dromi]] continue growing as they age, which initially does make them stronger with age. However, as they reach about 120 years old, the SquareCubeLaw takes into effect, making it very difficult to move, and they eventually get crushed by their own weight.
* The vampires in Creator/BarbaraHambly's ''Literature/ThoseWhoHuntTheNight'' and sequels grow tougher as they age, eventually becoming resistant to their weaknesses - an ancient vampire such as [[spoiler:Brother Anthony the Minorite]] can withstand the touch of silver that would burn and sicken a fledgling (newly created vampire) with even the slightest contact and even resist the light of the sun and the irresistible sleep that forces all younger vampires into a coma during the daytime hours. Their psychic powers (and presumably physical strength) also increase with age, although there are also possible, though inconsistent, degradations with age (the Bey of Constantinople, for example, [[spoiler:can no longer create fledglings on his own]]).
* In the ''Literature/WizBiz'' series by Rick Cook, dragons grow larger and more powerful with age, and have no known natural upper limit to their lifespans.
* The Nobility in the ''LightNovel/VampireHunterD'' universe are also like this; and since the series takes place in the far future circa 12000 AD, where most of the time between now and then was dominated by vampiric rule following a nuclear Armageddon TwentyMinutesIntoTheFuture, some are [[TimeAbyss very old indeed]]. Downplayed in that a recent human uprising wiped out most vampires, and that those remaining, for all their terrible power, are a dying race. One of the recurring themes of the novel is that while humans are, on the whole, [[PunyEarthlings weak]], [[WeAreAsMayflies short-lived]], and otherwise [[HumansAreFlawed flawed]], vampires have an even greater, fundamental flaw which dooms them to eventual extinction; as the [[{{Dracula}} Revered Ancestor]] once put it when speaking about his kind, "Transient guests are we." [[spoiler:It just so happens that [[{{Dhampyr}} D himself]] is the most successful result of a cross-breeding program by his father [[LukeIAmYourFather (the aforementioned Revered Ancestor)]] aimed at creating a new breed of vampires without this flaw, thereby ensuring the species' continuance.]]
* Trolls in ''Literature/{{Discworld}}'' are theoretically immortal, but as they get older they get bigger and slower and tend to be more inclined to sit and think. They call this "getting philosophy". Eventually they just stop moving altogether, gradually "decomposing" or eroding into an oddly shaped heap of minerals with a tiny living spark in the center. Many of the Discworld's mountains are actually very old trolls. Shown to be true when a troll warns a character about his grandfather, who is one of the mountains and is very annoyed when some adventurers light a campfire in his mouth.
* Darklings from the ''Literature/{{Midnighters}}'' series grow much, much stronger with age. Of course, they also get crazier with age.
* In ''Literature/TalesOfKolmar'', the [[OurDragonsAreDifferent Kantri]] grow throughout their lives, molting their armor every fifty years or so. The Eldest in that series, Shikrar, is over eighteen hundred years old and the largest of them, as well as a good fighter and the best flyer - though that last can't be attributed to his age, he became the best flyer and held on to that distinction from a much younger age. On their own Kantri reach about two thousand years before they die, which isn't discussed but it seems to happen fast. It's also noted that some grow "old before their time" and start to mentally slip; Shikrar suspects that another Kantri is one of these and guiltily wonders if he'll die in his sleep well before the two thousand mark, as these often do.
* Inverted in David Wellington's 13 Bullets (and sequels). A vampire is never as strong again as it is its first night. They gradually grow more decrepit, requiring more and more blood to stay active. Older vampires are a threat because of greater experience and because their vampire progeny protect and feed them.
* Queens and Consorts in ''[[Literature/BooksOfTheRaksura The Books of the Raksura]]'' grow larger and stronger with age; Moon has to inform his peers when they meet an elderly Islander that most "groundling" races don't do that.
* In [[Creator/RobinMcKinley Robin McKinley]]'s ''{{Literature/Sunshine}}'', this appears to be true of vampires, with some twists. Classically, in-setting, an old vampire is a master vampire, and [[EldritchAbomination very, very strong]] -- their mental powers become vastly more potent, allowing them to accrue minion-vampires. However, the longer they survive in that way, the less capable they are of [[WeakenedByTheLight enduring sunlight]], until even moonlight is crippling and they can't even speak the word. Hence the minions, who join in the hopes of gaining power themselves. The main character discovers through a relatively FriendlyNeighborhoodVampire that it is possible to become equally powerful, maintain independence, and never create or join a gang... but the gang-leaders don't want their minions finding that out, and even if they did, they may not be interested in tightening their moral standards.
* The ''Literature/NightHuntress'' novels have a variation on this: age brings power, but how much depends upon the vampire. Some take centuries to become masters, while others reach that level in a few decades. When Cat first fights Ian and learns that he's around 200, she comments "You're strong, then. I've met 700-year-olds who don't hit as hard as you do."
* The ''Literature/ImmortalsAfterDark'' series' titular beings.
* Likely inspired by the Tolkien example, dragons in ''Literature/ASongOfIceAndFire'' never stop growing as long as they have freedom and food. Captive dragons reach an upper limit depending on the space constraints of their environment. It's unknown whether they ever die of old age or disease, but until they die, the older, the stronger.
* In ''Literature/TheJungleBook'', it is mentioned that Kaa the Rock Python owes his great size and strength to the fact he's over a hundred years old, and he's still in his prime and growing. In the story "The King's Ankus", Mowgli meets a cobra named White Hood of a similar age, size, and strength to Kaa. [[spoiler:However, while White Hood has great size and strength, his body stopped producing venom and he's gone senile.]]
* [[OurOrcsAreDifferent Koloss]] in ''Franchise/{{Mistborn}}'' are like this; they never stop growing larger and stronger throughout their lives, and elder koloss (approx. 20 years) are around fifteen feet tall and ''incredibly'' dangerous opponents. They don't get much older or bigger than that, though; in a nod to TruthInTelevision, if battle doesn't kill them, their massive size causes heart failure.

[[folder:Live Action Television]]
* Vampires work this way on ''Series/BuffyTheVampireSlayer''. Older vampires become stronger, tougher, and more demonic in appearance, and may pick up other powers, like Dracula's tricks. When Spike is first introduced, Giles initially dismisses him as a big threat when he discovers Spike is scarcely over 100 years old (shortly after, he discovers Spike's [[HeroKiller full history]] and reconsiders). Kakistos was noted as being an extremely old vampire and thus a bigger threat. His age meant he had lost most traces of a human appearance and a standard size stake wouldn't do the job, so [[spoiler:Faith had to use a two-by-four to finish him.]] TheMaster (referred to as "the oldest vampire on record") was another vampire old enough to have stopped looking human, and had somehow gained the power to open the Hellmouth. The Master also took a larger-than-usual stake, dying when he was impaled on a broken table leg. And unlike other vampires who turn completely to dust when killed, the Master's skeleton remained intact. [[spoiler:Until Buffy smashed it with a sledgehammer to prevent his revival in a ritual]]. Notably, the Master's inhuman appearance closely resembles that of the Turok-Han or "ubervamps" ("pure" vampires rather than former humans) of Season 7, leading some to [[EpilepticTrees speculate]] that he was the very first human to be turned into a vampire.
** In a curious aversion, the vampire who called himself The Prince of Lies was, like the Master and Kakistos, very old and extra demonic in appearance, but seemed rather weak; Angel killed him easily. This might have been due to the element of surprise, but you'd think such an old vampire would have better reflexes.
** While age is a major favor in vampires' strength, bloodline seems to matter too. Spike, while not at all ancient, is by bloodline just 4 generations removed from the Master.
* Pretty much the same in ''Series/MyBabysittersAVampire''. The three teenage vampires in the main cast are pretty much incapable of winning a fight against older more experienced vampires under normal conditions. But they are able to get through difficult fights with team work and determination.
* In ''Series/{{Moonlight}}'', Mick senses (or rather smells) that Lance is very old, who further reinforces this by jumping from a tall building (impressing even Mick) and surviving being burned (any part of a [[OurVampiresAreDifferent vampire]] that touches fire is normally instantly turned to ash). Coraline also somehow survived being trapped in a burning building and could move with a stake in her chest, which is normally impossible. By contrast, the 700-year-old Lola was pretty handily defeated by Mick, despite being able to move much faster than him, and one of her past careers was a PirateGirl.
** Lance and Coraline are able to survive fire because access to a temporary cure to vampirism, that was used during the French Revolution. Many of the French Royalty and Aristocratic class were vampires. The Revolutionaries would test them with fire and if their fingers turned to ash, they would be beheaded. The cure made from an now extinct plant, allowed the vampires to mimic humans including burning without turning to ash.
* In ''Series/TheVampireDiaries'' vampires all become stronger as they age, although the difference can be overcome through numbers, surprise, anti-vampire weaponry, or other tactics. The oldest of them, the Originals, get a whole bunch of nifty powers and are next to impossible to kill. When they did manage to take one down, he would only remain dead as long as the magical knife that killed him wasn't removed, and his body remained indestructible.
* Vampires from ''Series/TrueBlood''. Battles between vampires are always determined by how old each vampire is. Even the difference of about a year makes all the difference. They also seem to develop the ability to fly over time. However, their weaknesses also get more severe. A 2,000 year old vampire will burn up in the sun within seconds, whereas a younger vampire will take minutes.
** Faeries also become more powerful with age. Their skills and power with [[LightEmUp photokinesis]], telepathy, etc improve over the centuries.
* ''Series/{{Being Human|UK}}'': This seems to apply to vampires, ghosts and werewolves.
** Vampires. While Old Ones still can be killed as easily as any other Vampire, they have a lot more "tricks" under their belt, with some such as Wyndham being able to casually enter without an invitation, something that would cause most Vampires to instantly begin to ''boil alive''. Some physiological changes seem to occur with age as well. Mr Snow, the leader of the Old Ones, has developed a sickly pallor, rotting teeth and protruding black veins due to his advanced age, and had SuperStrength far beyond that of younger Vampires and Werewolves, being able to tear a man's ''inner organs'' out with his bare hands.
** Ghosts are also stated to get stronger with age. Most however fail to get that far due to losing their connection to the mortal world, leading them to simply fade away into non-existence.
** Werewolves age normally, but they get stronger every time they turn. A werewolf who has been changing for years will be able (when transformed) to kill vampires with his bare hands.
* ''Series/ForeverKnight'' worked this way. Lacroix was able to survive being impaled with a burning stake, and both Nick and Janette were also more resilient than many younger vampires. Also, Lacroix got his butt handed to him by his "vampire mother", who was a teenage girl when she was turned.
* On ''Series/{{Supernatural}}'', every species that's older than yours is more powerful. One of the oldest species, Leviathans, trump almost everything in their strength and dexterity, and the mother of all monsters, Eve, has the ability to rob an angel of its power.
* ''Series/{{Smallville}}'': As the years/TV seasons go by, Clark gets stronger and more powerful. Just compare Season 1, when gunfire bruised his skin, to Season 5, when he survived atmospheric reentry without a scratch.

[[folder:Religion And Myths]]
* In Japanese folk thought, foxes ({{Kitsune}}) grow a new tail for every hundred years they live, with a proportional growth in power, to a maximum of nine, at which point they're pretty much {{Physical God}}s.
** In fact, there's a whole subgroup of {{Youkai}} / {{Obake}} called Tsukumogami (kami of a tool) who were former ordinary objects or animals who acquired supernatural powers and sentience after being used/living long enough (usually about a century).

[[folder:Tabletop Games]]
* ''TabletopGame/DungeonsAndDragons'' has this happen to many creatures. Vampires, dragons, liches and others tend to grow more powerful as they age. The ''TabletopGame/{{Ravenloft}}'' setting is especially keen on doing this with TheUndead. Pictured above are red dragons. For the record, the second largest one is an "adult". The top one is an ancient.
* ''TabletopGame/{{Warhammer}}'' and ''TabletopGame/{{Warhammer 40000}}'' contains plenty of examples, and though many are due to the "more experience" version many others fit this trope.
** [[OurOrcsAreDifferent Orcs/Orks]] grow [[LargeAndInCharge larger, tougher and meaner]] with age, the oldest being hulking monstrosities even by their standards.
** [[LizardFolk Lizardmen]] are full of this ([[TruthInTelevision but see Real Life, below)]]. Slann and Saurus don't die of old age at all, and the latter species (along with some of the non-sapient monster species) also get tougher as they get older. Really the only thing controlling their population is that Slann have an [[DyingRace incredibly slow spawning rate]] and Saurus have an [[BloodKnight incredibly high death rate.]] [[note]] that while older Slann are [[OldMaster much more potent wizards]], this is due to TheMagicGoesAway rather than their individual age; those born in the TimeOfMyths were {{Reality Warper}}s, those born in TheGoodOldDays are merely very powerful, and those born in the last few centuries are about on a level with the magic users of other species.[[/note]]
** A more minor example, {{Space Marine}}s seem to grow in size along with rank and age. [[http://www.philipsibbering.com/WH40KRP/40K_9_Marine_1_Morphology.shtml It is theorized they practically never stop growing]], though it will lessen.
** Less noticeably, although dwarves do not get larger with age they do get notably tougher until they are near death.
* In the ''TabletopGame/{{Munchkin}}'' card game, "Ancient" is a +10 monster buff.
* ''TabletopGame/TheWorldOfDarkness''
** Vampires in the ''TabletopGame/OldWorldOfDarkness'' game ''TabletopGame/VampireTheMasquerade'' are stronger with age in two ways: experience and Generation. Older vampires are more experienced (obviously), have more and stronger Disciplines than neonates, and have influence over vampiric and human society. A vampire of lower Generation is closer to the blood of [[MonsterProgenitor Caine]] than a 13th-Generation neonate (the game's "default" new player characters), increasing their stat {{cap}}s and allowing them to spend more Vitae faster. And going even further, it starts getting scarier: There are sleeping vampires that were embraced before the Great Flood. They're strong enough that, when one of them woke up, ''large-scale orbital weaponry'' was needed to put it back down.
** In ''TabletopGame/ChangelingTheDreaming'', trolls become physically larger and stronger as they age.
** Masquerade's successor game in the ''TabletopGame/NewWorldOfDarkness'', ''TabletopGame/VampireTheRequiem'', subverts this with its Blood Potency stat. Like Generation, higher ranks of Blood Potency allow a vampire to spend more Vitae and have higher stats, but can't regain Vitae from animals and eventually humans. Instead of being a simple "I'm stronger than you" score, high Blood Potency invokes a psychological ''need'' to enter torpor, during which the vampire's Blood Potency drops and he forgets his experiences (the so-called "[[TheFogOfAges Fog of Ages]]"). Ergo, no Kindred ''stays'' stronger with age, since they depower while in torpor and their memories become faded dreams. Methuselahs, however, do not suffer the Fog of Ages. With the right Coils of the Dragon, it's possible to utterly avoid the increased blood thirst that comes with age. Meaning in a few centuries, we might have Blood Potency 10 blood gods running around that can still feed on humans rather then other vampires...
** ''TabletopGame/MummyTheCurse'', however, is an inversion of this trope -- a mummy rises at the peak of their power, but it quickly drops a rank and then starts to level out until it's at its weakest, which is when the mummy needs to go back to rest.
* In fantasy-steampunk RPG ''TabletopGame/WolsungSteamPulpFantasy'', trolls fall under this trope without exceptions. When they are about 50 years old, they start to burn out mentally, fall into fits of rage, and at some point they [[HulkingOut hulk out]]. Permanently. From this point, they become larger, more resilient and feral with age... and nobody ever checked just how old they can get. Usually, their family or the authorities will put them down shortly after the onset of this freakish senility. It's less pronounced with troll women, who don't lose so much of their brains - just their morals.
* The potential for power of ''TabletopGame/{{Exalted}}'' is tied directly to age, with {{cap}}s placed on their highest potential [[PowerLevel Essence]] based on how long they've lived (although there are a few magics that can break this). The highest levels of power are only available to Exalted who are more than a thousand years old. Due to the Great Curse, this also means that the ones with access to the high Essence charms are also the most likely to be utterly insane, driven mad by the Curse, and rather prone to even greater acts of madness while in Limit Break.
* One scenario in ''TabletopGame/BetrayalAtHouseOnTheHill'' reveals the house to be alive and capable of draining the inhabitants' life, making them age rapidly. (With the exception of the Traitor, who [[ImmortalityImmorality brings victims to the house in return for eternal youth]].) Character stats start dropping rapidly once a certain age is reached, but the youngest characters actually get a stat boost for a while as they become grownups.
* Dragons in ''TabletopGame/MagicTheGathering''. Dragons only get bigger, stronger, and smarter as they age. The last Elder Dragon, Nicol Bolas, is an incredibly dangerous villain who is "Dominaria's most ancient evil." They apparently can die of old age eventually, since one of Nicol Bolas' goals was to regain the immortality he lost when his Planeswalker Spark was weakened by the Mending.

[[folder:Video Games]]
* ''VideoGame/{{Fallout 3}}'' Super Mutants grow stronger (but ''not'' smarter -- the opposite is implied to be the case) with age. Super Mutant Brutes are younger and weaker than Masters, who are weaker than Overlords, who are weaker than Behemoths, who are the oldest. Not that this particular trait is not (explicitly) shared with their west coast counterparts.
** In fact, in ''VideoGame/{{Fallout 2}}'' the Super Mutants of Broken Hills are said to be slowly going weak and senile. This is probably due to being infected with a different strain of FEV (found in the Mariposa Military Base) than the mutants in the Capital Wasteland.
** Even the Capital Wasteland Mutants don't all follow the rule -- it is ''heavily'' implied that Fawkes, one of your companions, was one of the first East Coast Super Mutants, yet he's still a regular Super Mutant (albeit a ''supremely'' overpowered one if you've got Broken Steel installed.)
* ''VideoGame/{{Fallout 4}}'' Super Mutants are similar to [[VideoGame/{{Fallout 3}} Vault 87]] Super Mutants, with Behemoths being the biggest and the dumbest, its mind buried under primitive rage. ''Far Harbor'' has Gulpers mutant salamanders that get bigger and hungrier as it gets older, the largest of which can swallow a person whole.
* The [[GreenSkinnedSpaceBabe asari]] in ''Franchise/MassEffect'' are said to show this, at least with regards to their biotics, which grow in power as they reach the matriarch part of their life cycle. Kaidan Alenko suggests that this is not restricted to asari, noting the increase in his own biotic abilities over the previous three years.
* A few of the legendary Dragon-type {{Pokemon}} count, but the ''very'' old [[GiantFlyer Rayquaza]] stands out the most. Although it had lost nearly all of its teeth through the decades, it still flies and battles as if it hasn't aged a bit. Not to mention its high attack stats. The Creation Trio have special mention here, since they literally created the ''universe'' itself and still live on to present day. Although, that's probably because two of them are literally [[PhysicalGod gods,]] while the third one is [[DracoLich undead.]]
* ''Franchise/DragonAge''
** Dragons only get more powerful with age. The Darkspawn also demonstrate the same is true of them, with a mini-boss Hurlock Vanguard in the Deep Roads called "Ancient Darkspawn."
** In ''VideoGame/DragonAgeII Legacy'', there's [[spoiler: Corypheus]], the most ancient Darkspawn (or at least, one out of half a dozen of them).
** The same could be said of the Grey Wardens, due to the Darkspawn Taint within them getting stronger over time (at least they seem to understand the Darkspawn better). However [[spoiler: after 30 years, [[WithGreatPowerComesGreatInsanity they gradually start to go insane]] as the Taint turns them into Ghouls.]]
* Some of the monsters in ''VideoGame/DarkSector'' are stated as getting larger and stronger with age. Just before a boss fight, an ally warns you, "This one is very old!"
* Vampires in ''Franchise/TheElderScrolls'' grow more powerful as they age. Vampire Ancients are the oldest and strongest vampire mooks/bosses, and Vampire Lords of Skyrim, who are the first and oldest vampires of their entire clan and received their vampirism directly from the evil god Molag Bal, are the strongest named vampire characters.
* In ''VideoGame/LeagueOfLegends,'' the Voidlings created by Malzahar grow more powerful every six seconds. Eighteen seconds after they are created, they just die.
* ''VideoGame/{{Touhou}}''
** While many characters are powerful due to winning the SuperpowerLottery, many more obtained it seemingly by virtue of being around for so long. 500 year old Remilia is almost as powerful as her sister Flandre, despite the latter possessing the second biggest StoryBreakerPower in the setting. [[PhysicalGod Kanako and Suwako]] are more than 2300 years old and with power worthy of their station, despite the years with [[GodsNeedPrayerBadly barely any faith to sustain them]]. Yuuka is noted as one of the oldest living youkai, as well as one of the strongest, despite her explicit ability being [[GreenThumb making flowers bloom and face the sun]]. Eirin is a TimeAbyss and quite possibly only surpassed in power by [[RealityWarper Yukari]], with even [[GodModeSue the Watatsuki sisters]] respectful towards her. And Fujiwara no Mokou is a human who is now EX-Boss strength, due solely to the [[{{Immortality}} immense amount of time she has to practice]].
** Ran Yakumo is a Kitsune and Chen is a Nekomata. Both are Youkai who were originally animals, but grew stronger with centuries of age.
* [[WhenTreesAttack Woses]] in ''VideoGame/BattleForWesnoth''. Elder and Ancient Woses are stronger than normal ones and sapling.
* Nym, from the ''StarWars'' ''Starfighter'' series, is a Feeorin, who are specifically noted to grow progressively stronger as they age. And since they can live as long as four hundred years, that's quite a lot of room for growth. Because of this, their society is ruled by "the Exalted" who is simply whoever is the oldest living Feeorin.
* Liir from ''SwordOfTheStars'' have this; the older they grow, the larger they get and the more powerful their psionic abilities become. The only thing limiting their size, and eventually causing their death, is the SquareCubeLaw. [[spoiler:Of course, some didn't like that last bit, preferring to enslave the younger ones to make them build spacesuits for them, so they could live in space and remove that last limit on their immortality. Very few remain of those who did this, but just one can wreck whole armies]].
* Dragons in ''VideoGame/CastleOfTheWinds'', with "Ancient" ones the strongest of all.
* ''VideoGame/LegacyOfKain:'' Vampires "evolve" over time, occasionally entering a cocoon-like state and emerging changed; Typically stronger and with new abilities, as well as less human. But Kain's [[spoiler:spiritual and mental corruption]] caused his descendents to eventually degenerate (or something similar). It's implied that a vampire's evolution conforms to his personality; Vorador's chin horns used to be a similar beard, human Rahab's armor had a seahorse painted on it, and Raziel told Zephon the latter's final form is a true representation of his soul. It's revealed in ''Soul Reaver 2'' that some changes, like the typical three-fingered hands, are [[spoiler:the turned vampires becoming more like the originals]].
* In ''VideoGame/GuiltyGear'',
** Slayer is a [[OurVampiresAreDifferent Nightwalker]] who is several hundred years old, the original founder of the assassin's guild, and one of the most powerful characters in the series. It's heavily implied that he's holding back on the whole cast; even if you utterly [[CurbStompBattle destroy]] him in a fight, he'll just lie on the floor with his head in his hand, casually chilling out.
** Jam Kuradoberi, who is told after fighting Slayer that given enough time, she'll end up surpassing him.
* ''VideoGame/TheLastOfUs'' has an interesting example. The infected in this game are, [[RealityEnsues well, infected]], so most of them don't live for very long before dying and become spore fountains. For the handful that do survive in the long-run, though, they become more dangerous with age. Newly-turned Runners aren't able to do all that much damage, and neither are Stalkers, although they're more stealthy. After a few months to a few years, though, the infected become Clickers, who can easily one-hit the player. The oldest infected, probably from the initial outbreak twenty years ago, grow to be [[BossInMooksClothing Bloaters]].
* Dragons in ''VideoGame/FinalFantasyXIV'' are shown to be not only really freaking old (some living for hundreds of years and a few even reaching a thousand or so), but they get bigger and stronger as they get older. Dragons, especially the older ones, can also recover from nearly any wound and injury by simply just sleeping it off.
* The titular creature in ''VideoGame/ProjectWight'' grows larger and more powerful with age, in addition to developing new and deadly abilities.

[[folder:Visual Novels]]
* The {{Franchise/Nasuverse}} runs on this trope, with the most powerful magical families being the oldest, the ancient vampires being the strongest, and one of the greatest Servants being [[Literature/TheEpicOfGilgamesh Gilgamesh]], the oldest hero of humanity.

[[folder:Web Animation]]
* In ''WebAnimation/{{RWBY}}'', the Grimm get bigger, stronger, and ''[[ItCanThink smarter]]'' over time. Some {{Kaiju}}-sized ones are centuries old.

[[folder:Web Comics]]
* Immortals from ''Webcomic/ElGoonishShive'' continue to get older, smarter, stronger, [[WhoWantsToLiveForever more bored]] and [[WithGreatPowerComesGreatInsanity less sane]] until the point comes where they basically become [[PersonOfMassDestruction People Of Mass Destruction]]. To prevent this, they voluntarily undergo a kind of ritualistic death/rebirth cycle every couple of centuries to lose most of their power and memories so they can start over and keep things interesting. A significant portion of one arc is driven by [[spoiler: [[NamesToRunAwayFromReallyFast Pandora Chaos Raven]]]], an immortal who refuses to let go of her accumulated power, and seems to be approaching EldritchAbomination territory.
* In ''Webcomic/GirlGenius'' Jägermonsters become bigger and less human-looking as they age. We get a better look at these changes [[spoiler: when Vole is artificially aged a few hundred years and he goes from looking like a big guy with white skin, black eyes and small fangs to being maybe half again the size he was before, with spines protruding from his now green skin, and having sprouted a tail.]] As a result, a threat that would take a huge platoon of regular Jaegermonsters to handle can be trounced with no losses by four of the centuries-old generals.

[[folder:Western Animation]]
* Mumm-Ra on ''WesternAnimation/{{Thundercats}}'' is the BigBad partly because he's a thousand years old.
* In ''WesternAnimation/AvengersAssemble'', an Infinity Gauntlet-powered Thanos uses the Time Stone to instantly age most of the Avengers into dust. When he tries it on Thor, Thor just grows a BadassBeard, declares he's now even stronger, and smashes the Time Stone with {{Mjolnir}}, turning its effects back on Thanos and forcing him to undo all of it.
* In ''WesternAnimation/{{Zevo3}}'', this is the reason the Zevo compound works better than it did when Stankfoot first created it. He even lampshaded it.
* In ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' the Alicorn Princesses seem to function under this rule. Twilight and Cadance are definitely a step above the average pony, but are still fairly young and aren't ''that'' much more powerful. Celestia and Luna, on the other hand, are each at ''least'' a thousand years old are so powerful that their primary responsibilities involve manually moving the Sun and Moon around.

[[folder:Real Life]]
* TruthInTelevision: [[http://www.cracked.com/article_18483_the-5-creepiest-serial-killers-who-were-animals_p2.html Gustave the Crocodile]] is over 66 years old, believed to be over twenty feet long and two thousand pounds heavy, and still killing people and even ''hippos''.
* Trees, sequoia in particular.
* Lobsters are a perfect example. According to recent research, a lobster does not weaken or slow down with age. In fact, it becomes more fertile as it gets older compared to younger lobsters. Barring injury, disease and capture they can live on indefinitely, reaching impressive sizes. All this is attributed to telomerase, an enzyme that repairs DNA sequences of the form "TTAGGG".
* Reptiles in general. Most animals reach a certain size and stop growing. So long as a reptile doesn't get killed or die by other means it just keeps getting bigger and bigger as it ages. Of course, they still die of old age at some point.
* Sharks. It is believed that some great whites still swimming the seas today are centuries old. A great white shark is believed to keep growing until it's killed, and since any that die of old age are likely to get eaten before humans can look at them[[note]]It's difficult to get a captive great white shark to eat, so few attempts are even made at capturing them anymore. A handful of aquariums periodically capture a juvenile great white, but they're invariably released back into the wild after a few months to ensure their survival.[[/note]] it's anyone's guess how long they live.
%%* Some species of whale. While most of the big whales live 60-70 years, bowheads are believed to have very long lifespans. Whales captured by native whalers off Alaska in the 1990s were found to have harpoon heads embedded in their blubber which were last used by native Alaskans in the 1800s. A whale killed in 2007 had the tip of explosive harpoon head deep in its blubber that had been manufactured around 1890, indicating it had survived a previous hunt at least a century earlier.
* Most animals, really. Mammals, with their short stage of rapid growing, limited reproductive life and only two sets of teeth are the exception, not the rule.
%%* There was a koi fish named [[FloralThemeNaming "Hanako"]], who passed through several different owners. She lived to be 228 years old! (For reference, the average koi lifespan is about 50 years, although there are plenty that live longer. To date, none are known to have lived as long as Hanako, however.)
* Within the realm of certain sports, this is true of athletes, particularly in fighting sports such as Mixed Martial Arts. An athlete at 20 years old has yet to completely fill out and will get stronger as he ages and does more weight training. Heavyweights are generally not thought to be in their prime until their 30s. Strength is also the last thing to start declining as fighters age.