How Humans Might Live in 2100

My grandmother didn't know what a teenager was. Not because she lacked vocabulary — she was sharper than most people I've met — but because the category didn't quite exist in the world she grew up in. You were a child, and then you worked. G. Stanley Hall coined the term adolescence in 1904, and the modern concept of a protected, defined youth slowly followed. A few decades later, state pension systems began to formalize retirement as a distinct final chapter — Bismarck's Germany had started the idea as far back as 1889, but it was mid-20th-century policy, particularly the U.S. Social Security Act of 1935, that made retirement feel like a given. Which means that two of the most fundamental stages of a human life — the years when you're "still becoming," and the years when you've "earned your rest" — are relatively recent inventions, not ancient truths. My grandmother lived through the invention of one of them. She just didn't have a word for what she'd missed.

I've been sitting with that thought while watching a new video from the channel Some Guy Who Knows Stuff, which runs through ten ways life might look by the year 2100. It's a pleasant, well-paced tour of futurist thinking — cities that sense and adapt, automation rewriting the social contract around work, medicine that monitors you before you get sick, humans edging slowly off-planet. The video takes the form of a calm countdown, and at its best it lands something genuinely strange: "A person might pursue multiple careers, return to education several times, or experience entirely new life stages that do not currently exist."

Entirely new life stages. Sit with that. My grandmother didn't know what a teenager was. Somewhere alive right now is a person who will live long enough to inhabit a life stage we haven't named yet.

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I want to be honest with you about what kind of reader I'm bringing to this. If you came of age in the late 1990s or the 2000s, you have a complicated relationship with tech optimism. You were told the internet would democratize knowledge — and it did, and it also gave us algorithmic radicalization. You were told social media would connect us — and it did, and it also reorganized loneliness at scale. You were told the gig economy was freedom — and it was, for some people, for a while, on the right side of the equation. So when a video tells you that automation may bring shorter work weeks and universal income, there's a version of you that wants to ask: shorter for whom? Universal where?

The video earns partial credit for gesturing at this. It acknowledges that the shift away from work-as-identity "may challenge how people define purpose," noting that "for centuries, employment has shaped identity and social status." But the people who most need that acknowledged aren't abstractions. They're the factory workers in mid-sized American cities where the automated future arrived on schedule — and the UBI didn't. They're the delivery drivers watching their dispatch algorithms get smarter while their wages stay flat. The video describes the transition in the passive voice of inevitability; history tends to happen to specific people in specific places, and those people rarely experience it as a countdown list.

This isn't a knock on the video's ambition. It's doing something genuinely useful — assembling the terrain of possibility so the rest of us can argue about it. The smart city section is a good example. The video describes urban environments that sense and adjust in real time: traffic rerouted before jams form, buildings negotiating with power grids, street lighting calibrated to foot traffic. Some version of this is already running. Singapore's Punggol district operates sensor networks that monitor energy use and crowd density continuously. The early draft of the video's "city that thinks" is being lived by real residents right now, with all the convenience and the surveillance that entails.

The video doesn't name Punggol. It also doesn't name Toronto's Quayside project, where Sidewalk Labs — Google's urban tech arm — proposed a sensor-saturated neighborhood and then withdrew in 2020. The cancellation is worth knowing about, though the story is more tangled than a simple cautionary tale: privacy concerns were real and significant, but commercial factors and the disruptions of COVID also shaped the outcome. The lesson isn't that data governance always fails; it's that these projects generate genuine public conflict that the frictionless version of the future tends to skip past.

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The longevity section is where the video gets genuinely philosophically interesting, and where I kept wanting it to go further. The argument is familiar enough: wearable sensors monitoring your blood chemistry continuously, AI flagging cellular changes years before symptoms appear, gene editing correcting inherited conditions early. "Aging itself may become a central focus of research," the video notes, with treatments potentially slowing cellular deterioration so people "remain healthy and active far longer than previous generations."

Think about what that actually means for a person. Imagine a longevity researcher — and there are real ones, at places like the Buck Institute and the Karolinska — who has spent years thinking about what a 120-year human life would feel like from the inside. Not just the biology, but the texture: the marriages, the careers, the grief. How many people do you bury if you live to 120? How many times do you reinvent yourself before it stops feeling like reinvention and starts feeling like something else entirely? These are the questions the video reaches toward but doesn't quite land on, because landing on them requires imagining specific human beings rather than statistical projections.

The video does land something true when it notes that "living longer will introduce new social questions" — retirement systems, family structures, educational timelines, all built around lifespans nobody's body was producing yet. The more interesting version of this observation is personal: the assumptions quietly embedded in your own life plan — when to commit, when to pivot, when to settle — were designed for a shorter ride.

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On the digital reality section, I'd push back gently on one claim in the video's framing. The idea that smartphones have altered how we navigate, remember, and compare ourselves with others is widely discussed, and some of those effects are well-documented behaviorally. But claims about neurological change specifically — rewired memory systems, permanent structural shifts — remain actively contested in the research literature. It's worth holding that distinction. Behavioral change is real and significant; permanent neurological transformation is a stronger claim that the science hasn't fully settled.

That said, the video's broader point holds: we are already living in an early version of digitally mediated reality, and the boundary between where the phone ends and where you begin is already blurrier than we typically acknowledge. The leap to neural interfaces and fully immersive environments is large, but it's not starting from zero.

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The video closes where it's most honest: "The world of 2100 may not feel like a completely different civilization. Instead, it may feel like the natural continuation of thousands of small changes gradually reshaping how humans live, learn, explore, and understand their place in the universe."

That's the thing about transformation — it's rarely legible from inside it. My grandmother didn't experience the invention of adolescence as a historical event. She experienced it as the world her children grew up in, which was different from hers in ways that were sometimes wonderful and sometimes confusing and mostly just there. The people who will live in 2100 will not experience it as a countdown list of ten stunning innovations. They'll experience it as Tuesday, with all of Tuesday's texture and weight.

The question worth sitting with isn't whether these futures are possible. Most of them are. The question is whose Tuesday it will be, and who gets left out of the draft.

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David Oyelaran is Buzzrag's oral history and documentary correspondent.