[[caption-width-right:350:For God's sake, ''[[Film/GranTorino get off his lawn]]''.]]
->''"I'm Hub [=McCann=]. I've fought in two World Wars and countless smaller ones on three continents. I led thousands of men into battle with everything from horses and swords to artillery and tanks. I've seen the headwaters of the Nile, and tribes of natives no white man had ever seen before. I've won and lost a dozen fortunes, '''''KILLED MANY MEN''''' and loved only one woman with a passion a '''''FLEA''''' like you could never begin to understand. That's who I am. '''''NOW, GO HOME, BOY!''"'''''
-->-- '''Hub [=McCann=]''' (to the teen he's currently [[NeckLift choking]]), ''Film/SecondhandLions''
Old men are weak, right?
When it comes to fiction, more often than not the oldest, apparently feeblest characters are the ones to be feared the most. They [[EpicBattleBoredom kick ass, take names,]] and can [[OneManArmy fend off armies single-handedly]].
They can be the strongest character in the entire story. The reason for this is obvious: "Experience and treachery will beat youth and enthusiasm every time." Old men in a dangerous line of work have been doing it for a very long time, and only lived that long because they've been smarter and/or stronger than everyone they've faced. Additionally, in a CrapsackWorld, or when EarthIsABattlefield, a man may well only live to be old if [[HadToBeSharp he is already very bad-ass]] to start with.
The defining characteristic of the Badass Grandpa is that, as the story begins, they already have [[TookALevelInBadass several or max levels in Badass]], and will almost always have more than anyone else, including, in many cases, the BigBad; yet they generally opt for quiet and simple lives, sharing their wisdom with younger generations rather than directly involving themselves. After all, every generation of heroes has to grow up and fight on their own sometime, right?
Badass Grandpas hide their power level well...at least [[LetsGetDangerous until it really matters]]. When the chips are down, and the heroes look like they're in need of assistance, it's time for the Badass Grandpa to step up and throw down, proving that age has done nothing to quell their ability to take down villains literally decades their juniors.
If he's not TheHero then there will be a reason why he can't do the hero's job for them:
* He's not TheChosenOne
A Badass Grandpa may be ThePatriarch of a BadassFamily.
See also RetiredBadass. Compare CoolOldGuy, OldMaster, WhenEldersAttack, and EccentricMentor.
Is often TheObiWan [[ThisIsYourPremiseOnDrugs on steroids]]. Might overlap with GoodIsNotDumb. If it's an old woman who is the badass, it becomes NeverMessWithGranny. Both of them may have grown StrongerWithAge. May overlap with BadassBystander. If it's an evil person that ruined countless lives and still survived, see EvilOldFolks.
-->Yes sir, getting off your lawn now, sir. Please don't hurt me.