There's a playlist you made at nineteen that you can't listen to anymore. Not because the songs are bad, exactly, but because the person who chose them was so sure. Sure about the music, sure about the person the songs were secretly about. That person feels like a costume you once wore.
And yet. You're equally sure that the person choosing songs today is the real one. The finished one. The you who has finally arrived.
I want to gently ruin that for you.
the two-question experiment
Try this. First question: how much have you changed in the last ten years? Take your time. Most people, honestly answering, say: enormously. Different friends, different values, opinions you'd now argue against at a dinner party.
Second question: how much will you change in the next ten years?
Not much, right? You've settled in. The big renovations are done. Maybe some light furniture rearranging from here on out.
That asymmetry has a name. In 2013, Jordi Quoidbach, Daniel Gilbert, and Timothy Wilson published a study in Science covering more than 19,000 people between 18 and 68. At every single age, people reported having changed dramatically over the past decade while predicting they'd change very little over the next one. The 33-year-olds swore they were basically done. The 43-year-olds, looking back at 33, reported they'd changed a ton. The 43-year-olds then swore they were basically done. You can see where this goes.
The researchers called it the end of history illusion: the tendency to "regard the present as a watershed moment at which they have finally become the person they will be for the rest of their lives." History, in your personal telling, ends today. Everything before now was the messy prologue. Everything after now is just more of this.
It's not only personality. The same pattern shows up in values and preferences: the food you love, the people you'd call at 2am. And it isn't free. In one part of the study, people were willing to pay substantially more to see their current favorite band play a concert ten years in the future than they'd pay today to see the band they loved ten years ago. Read that again. They knew, from direct experience, that musical taste expires. They just couldn't believe theirs would expire again.
Gilbert's explanation for why the illusion feels so convincing is almost embarrassingly simple: remembering is easier than imagining. You have vivid footage of who you were at nineteen. You have nothing at all of who you'll be at thirty-five, so your brain quietly translates "I can't picture it" into "it won't happen." The future self isn't unlikely. It's just unfilmed.
Fair warning, because I'd rather you trust this essay than be dazzled by it: the study has a real methodological catch. As the British Psychological Society's Research Digest points out, the researchers didn't follow the same people for a decade. They compared "reporters" (people recalling their past selves) with "predictors" (people forecasting their future selves). Different groups, snapshot design. It's possible some of the gap comes from how we mis-remember the past rather than how we mis-imagine the future.
But even if you're skeptical of the illusion's exact shape, the claim underneath it, that you will keep changing, is on very solid ground. Brent Roberts and Daniel Mroczek's review of longitudinal research found that personality traits continue shifting across the whole adult lifespan, not just in the supposedly formative years. A 2022 meta-analysis by Wiebke Bleidorn and colleagues, pooling decades of longitudinal studies, confirmed it at scale: adult personality is a moving target. The person you'll be at forty-five isn't just you with more back pain. They're someone you haven't met.
your past selves kept receipts
This is where journaling stops being a wellness habit and starts being an epistemology.
Because the end of history illusion survives on a lack of evidence. You can't picture your future self, and your memory of your past self has been quietly edited into a coherent origin story for the current one. The one thing that breaks the spell is documentation: the actual words of the person you were, unrevised.
Anyone who's reread an old journal knows the specific vertigo of it. The crush that took up forty pages and whose last name you now have to think about. The job you swore you'd never leave. The certainty, always the certainty, radiating off every entry. It's cringe, sure. But the cringe is data. It's proof that a person you no longer are once occupied your exact coordinates and felt every bit as final as you feel right now.
This is honestly part of why we built Joice the way we did. When you talk out loud about your day and it becomes a searchable transcript, you're not just processing the present — you're leaving a paper trail for the future skeptic you're guaranteed to become. Six months later, the recurring themes it surfaces read like a message from someone else. Which, in a real sense, they are.
And this matters beyond nostalgia, because the illusion has its hands on your biggest decisions. The tattoo isn't the problem; the tattoo is cheap. The expensive version is signing a decade of your life to a career because it fits who you are today. Staying in a city, or a relationship, on the assumption that your current preferences are load-bearing walls rather than furniture. Quoidbach and Gilbert's subjects overpaid for concert tickets. We overpay for permanence everywhere.
I don't think the answer is to commit to nothing. People who treat every choice as reversible never build anything. The answer is smaller and stranger: hold your current self with slightly looser fingers. Make the commitment and know that the person keeping it will be someone new, and that this is fine, and possibly the whole point.
So here's the challenge. Tonight, write one entry addressed explicitly to the person reading it in ten years. Tell them what you're certain about: the music, the people, the things you'd bet money will never change. Be as sure as you actually feel. Don't hedge.
Then seal it, in whatever sense your journal allows, and go on believing you're finished.
The stranger who opens it will know better. And with any luck, they'll be sitting there, shaking their head at you with real affection, feeling — for the first time, obviously, and finally — completely done.