I Used To Be Smart

When I was a kid, I was super smart. My friends' parents wanted their kids to hang around me because of it. I remember end-of-term announcements when the teacher would ask "who is number one this term?" and the whole class would scream my name before she could finish. That was my identity - the smart kid. I never studied, never struggled, just absorbed everything like a sponge.

As I got older, that identity started to feel less certain. Not because anything went wrong, but because the world got bigger. The things I was good at as a kid - absorbing information, acing tests, impressing adults - stopped being the measure. Life started asking different questions, and the answers required a different kind of thinking. I found myself wondering if I was still smart, or if that was just something I used to be.

So I went looking. Not for a fix, because nothing was broken. Just for understanding. I wanted to know if other people felt this way too, and what it actually means when the version of yourself you were most proud of starts to feel distant.

It turns out, I am not alone

I stumbled on a thread in Reddit's ADHD community where someone in their mid-twenties asked the exact question I had been sitting with: "Why do I feel like I'm getting less smart as I get older?" They talked about how they used to sit down, learn stuff quickly, pull all-nighters, cram for an exam in a day. Reading that felt like someone had reached into my head and typed out my thoughts.

What struck me most were the responses. One person pointed out something I had never considered - that the issue is not intelligence, it is novelty. When you are young, everything is new. School is new, learning is new, the whole experience of being alive is new. And for people whose brains thrive on novelty, that constant stream of "firsts" is fuel. But as you get older, experiences start to repeat. The novelty wears off, and without it, your brain disengages. It is not that you got dumber. It is that your environment stopped being stimulating in the way your brain needs.

Someone else in that thread - a 32-year-old who had returned to school - said something that stuck with me. They said their thought process had fundamentally changed. They no longer wanted to just memorize a formula. They wanted to understand it, to be able to derive it from scratch. The depth of their understanding had gotten better. It just takes more work now. "The results do speak for themselves," they wrote. That reframing hit different.

And then there was the 57-year-old who simply said they were "getting stupider by the day" and barely cared anymore. Not in a defeated way - more like someone who had stopped measuring themselves by a ruler that no longer applied. There was something honest about that. Something freeing.

Two kinds of smart

Psychologists talk about two types of intelligence - fluid and crystallized. Fluid intelligence is the raw processing power: solving puzzles, spotting patterns, thinking on your feet. That peaks somewhere in your early twenties and then slowly declines. Crystallized intelligence is everything you have learned and experienced over the years - vocabulary, judgment, accumulated knowledge. That keeps growing well into your sixties and seventies.

When I look at it that way, nothing was lost. There was a trade happening the whole time. The raw speed gave way to depth, context, and the ability to see things from angles I never could before. The problem is that nobody tells you this trade is happening. You just notice the speed changing without recognizing what replaced it.

The full hard drive

There is a way to think about this that clicked for me. Your brain is like a computer. When you are young, the hard drive is basically empty. Every search query comes back instantly because there is almost nothing to sort through. But as you live more life - relationships, jobs, failures, cities, people, books, mistakes - that database gets massive. When you are trying to recall something, your brain is not failing. It is searching through a much larger library. Researchers call this cognitive interference. The retrieval takes a different path, but the collection is enormous.

One of the Reddit commenters put it well - they said returning to school in their thirties felt different because they had so much information and experience already that new information would interact with what was already there. Your brain is not empty shelves anymore. It is a warehouse. The way you access things changes when the warehouse is full.

The firstborn weight

I am the firstborn in my family, and I think that adds a whole layer to this that I did not fully understand until I watched a video by Wise Joe about why some people feel older than their age. He talks about how children who grow up with heavy responsibilities - and being the firstborn almost always means that - develop their prefrontal cortex faster than their peers. The part of your brain responsible for decision-making and impulse control matures ahead of schedule because it has to. Your brain literally rewires itself to meet the demands of your environment.

He describes this thing called parentification, where a child takes on the emotional or practical role of a parent. You learn to read the room before you learn to read books. You become fluent in tension - who is upset, what needs to be managed, how to keep everything from falling apart. That makes you a reliable, empathetic adult, but it also means you have been running at full capacity for a very long time. You never actually learned how to just exist without being useful.

That resonated. The hyper-vigilance, the constant scanning, the weight of responsibility from a young age - he calls it a survival adaptation. You learned to process everything deeply and quickly. One year of living like that carries the weight of three. When I think about how much my brain has been doing since childhood, it makes sense that my relationship with my own intelligence would shift. It has been working differently for a long time - not less, just differently.

You are not dumber, you are just grown

On Quora, someone shared a story that mirrored mine almost exactly. They said when they were a kid, they were the best student in school - not just in their class, but in their entire generation. Then puberty hit and their focus shifted. They could still see that they grasped complex ideas better than others, but their attention was going to different places. They were not dumber. They were just thinking about different things.

Another person on that same thread wrote something I keep coming back to. They said intelligence is like fitness - when your lifestyle changes, your body changes. Your brain works the same way. They had struggled academically at one point and a few years later had completed college courses in algebra, physics, chemistry, and calculus. Not because of some natural gift. Because of work. That is a different kind of smart than what we celebrate in childhood, but it is arguably more real.

When I was a kid, my only job was to learn. My brain was in a constant state of forming new connections because everything was new. As an adult, life asks you to do a hundred things at once - work, relationships, money, decisions, identity. The bandwidth gets distributed differently. That is not decline. That is just what it looks like when your brain is serving a more complex life.

There is also something called the Dunning-Kruger effect, but in reverse. When you are young, you do not know what you do not know. You feel sharp because the world feels simple. As you grow and actually understand how complex everything is, you become more measured. That can feel like a loss of confidence, but it is actually awareness. Knowing the limits of your knowledge is a deeper kind of intelligence than assuming you have it all figured out.

What I actually learned

I am not as smart as I used to be. Not in the way I used to define smart. But that definition was always going to be temporary. The kid who topped his class without trying was operating in a small world with small problems. The version of me that exists now navigates complexity that kid could not have imagined. That version of smart was narrow - good at tests and memorization and impressing adults. The version I have grown into is wider, quieter, and far more capable.

The Wise Joe video ends with something that I think about often. He says that feeling older than your age - feeling like something has shifted - is actually proof that you adapted. Instead of trying to recapture the lightness you had as a child, the real peace comes from accepting your deep, thoughtful nature and building a life that fits it.

The feeling of losing your intelligence is really just the feeling of outgrowing one definition and not yet being comfortable with the next one. Growth does that. It makes the old skin feel tight before the new one fits.