Somewhere in the Wechsler Adult Intelligence Scale, the test most psychologists reach for when someone wants a real IQ number, there is a section called Comprehension. It asks things like why laws exist and what you should do in a particular social situation. For decades it was described, in plain language, as the common sense part of the test.
Then the fourth edition came out in 2008 and quietly moved Comprehension to the optional pile. You can still give it. It just no longer counts toward the full-scale score.
Pearson, the test’s publisher, notes that Comprehension became a supplemental subtest in the WAIS-IV, with more weight shifted to processing speed instead.
That is a fair summary of what happened to common sense in general over the last forty years. It got demoted to optional. Nobody decided it didn’t matter. It simply stopped being measured, and things that stop being measured tend to stop being taught.
The people who grew up in the 60s, 70s and 80s learned theirs the old way, before the demotion. They learned it from parents who had been through enough that very little registered as an emergency, from neighborhoods that ran on unwritten rules, and from a thousand small situations where nobody was coming to help.
What they ended up with is a set of practical instincts that look nothing like a test score and matter more than one.
1. They know the difference between an emergency and an inconvenience
A flat tire is an inconvenience. A flat tire on a highway at night in the rain with a kid in the back is closer to an emergency. People raised before cell phones learned to sort those two categories fast, because the response to each was completely different and there was no one to ask.
That sorting instinct runs constantly in the background now. The late package, the cancelled flight, the dishwasher that quit. They assess it in a few seconds, assign it a size, and respond at that size.
Younger people often respond to everything at the same volume, partly because everything arrives through the same screen with the same notification sound. The ability to tell a seven from a two is not on any IQ test, and it may be the single most useful thing a person can know.
2. They can find their way back to the car without a phone
They parked, looked up, noted the light pole with the number on it, and walked in. When they came out two hours later, they walked back to it. No photo of the parking spot. No pin dropped. Just a glance and a mental note.
That skill scales.
They can leave a hotel in a city they have never visited, walk a few blocks, and find their way back by remembering the church on the corner and the fact that the water was on their left. They have an internal map, and they trust it.
Research suggests the map is a muscle.
A 2020 study of regular drivers from McGill University found that heavier lifetime GPS use was linked to worse spatial memory, and the decline tracked with GPS use over time rather than the other way around. The sample was small, which the authors flag themselves.
People raised in the 70s built that muscle for years before anything could do it for them. It is still there.
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3. They know roughly what things should cost
Ask someone raised in the 60s what a plumber should charge to replace a water heater and they’ll give you a range. They may be off by a bit, but they won’t be off by a factor of three. They have a running ledger in their head of what things are worth, built from decades of paying for things in person and watching the number on the register.
That ledger is what lets them walk away. The quote is too high, the “limited time” price is a regular price in a costume, the add-on at the counter is pure margin. They don’t need to research it. Something in them already knows.
Younger buyers have fewer reference points, because so much of what they buy is a subscription, a bundle, or a number that changes depending on who is looking. When you have never seen a stable price, you have nothing to compare the new one to.
4. They can read a room before anyone says a word
They walk into a kitchen and know within a few seconds whether this is a good night or a bad one. The radio is off. Someone is wiping a counter that is already clean. A chair is pulled out at an angle that says someone left it in a hurry.
Nobody taught them to notice this. They learned it in houses where moods were not explained, at dinner tables where you figured out the tension from who was not talking, and in school hallways where reading a teacher’s face correctly could save you an afternoon.
There’s evidence this ability depends on practice.
In a 2014 UCLA study, sixth graders who spent five days at a camp with no screens improved significantly at reading facial expressions and nonverbal cues compared with a control group that kept their usual media habits.
Five days moved the needle for those kids. People raised in the 70s had eighteen years of it.
5. They know when a deal is too good to be true
The free vacation that just needs a credit card to hold the spot. The job that pays twice the going rate and starts tomorrow. The investment a stranger is excited to share. Someone raised in the 80s hears any of those and a small alarm goes off before the sentence is over.
It is tempting to assume older people are the ones getting fooled, and the big-dollar losses do skew older. But the frequency runs the other way.
The Federal Trade Commission found that in 2021, adults aged 18 to 59 were 34 percent more likely than people 60 and over to report losing money to fraud, with online shopping, cryptocurrency and job scams leading the list.
Older adults, meanwhile, were far more likely to report a scam they spotted and walked away from without losing a cent.
That last number is the one that matters. Spotting it and walking away is the whole skill.
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6. They can tell when something is worth fixing and when it’s done
This is two skills that look like one. The first is knowing how to fix things, and plenty has been written about that. The second is subtler and more valuable: knowing when to stop.
The lawnmower that has needed a new part every spring for four years is done. The relationship where every conversation requires a repair is done. The project that has absorbed three weekends and is still at 80 percent is, in most cases, done at 80 percent. People raised in the 60s and 70s have a feel for the point where more effort stops buying more result.
Psychologist Robert Sternberg spent years arguing that this kind of practical judgment is separate from the reasoning IQ tests measure, and in one study of rural Kenyan children, scores on a test of practical know-how correlated trivially or even negatively with academic measures.
Critics have pushed back, arguing his practical intelligence overlaps more with general intelligence than he claimed, and the debate is not settled.
What isn’t in dispute is that nobody is handing out a score for knowing when to quit. The people who have it just have it.
7. They can talk to a stranger and get what they need
The store is out of the thing. The flight is oversold. The form is missing a signature and the office closes in ten minutes. Someone raised in the 80s walks up to the counter, makes eye contact, explains the problem in two sentences, and asks what the person can do.
Not what the policy says. What the person can do.
They learned early that most rules have a human standing next to them, and that the human usually has more room than the rule suggests, especially if you are polite and specific and do not make it their fault.
This isn’t charm. It’s the practical knowledge that a stranger is a resource, not a threat, and that most people would rather help than argue. Younger people often default to the app, the chat window, the form, because those were there first. The counter still works better, and it always will.
8. They know that most problems can wait until morning
The argument at 11 p.m. does not need to be resolved at 11 p.m. The email that landed at 9 can be answered at 8 the next day. The decision that feels urgent at midnight will look different, and usually smaller, after sleep.
People raised before the always-on phone absorbed this without trying, because the world used to close. Stores shut. Offices went dark. The person you were upset with was unreachable until tomorrow, so you went to bed, and by tomorrow it had often sorted itself.
That enforced pause turned into a habit, and the habit turned into judgment. They know which problems are actually time-sensitive, and they know the list is short. Everything else gets the overnight test.
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9. They can tell what matters from what is loud
The loudest thing in a room is rarely the most important thing in it. The angriest email is rarely the one that needs the most attention. The headline with the most capital letters is rarely the story that changes anything.
Someone who grew up with three TV channels and a newspaper that came once a day had a slower information diet, and a slower diet gives you time to notice what sticks. They got used to asking a simple question of everything that came at them: will this matter in a week? Most of it did not.
Now that everything is loud, that filter is doing more work than it ever has. They are not ignoring the noise. They are weighing it, and most of it comes up light.
None of this shows up on a test, and that’s the point
Common sense has a reputation problem. It sounds like something everyone has, which makes it sound like nothing. It is also, as it turns out, hard to pin down.
When University of Pennsylvania researchers Mark Whiting and Duncan Watts tried to measure it, asking more than 2,000 people to rate thousands of claims, they found that agreement on what counts as common sense shrinks as the group gets larger, and that no age group, education level or political side had a clear edge.
Which means this is not an argument that one generation is smarter. It’s an argument that one generation got a specific kind of practice, in a specific kind of world, and came out with instincts that the current world no longer builds on its own.
You can’t score it. You can only notice it, usually at the exact moment someone else is standing frozen at the counter, and the person next to them has already figured out what to do.
