I had kids and finally settled into a career at 33. It certainly forced me into adult mode after this.
I just met up with my Brother-in-law and his friends for our yearly gathering. All of them are in their 30s and none of them are in what I would consider 'adult mode'.
They are all un-married/no kids, barely scraping by, partying every weekend/wasting money on weed and booze. Certainly no careers (mostly retail, some unemployed and still living with parents).
I wonder if these numbers will change with the new generation, because so many are not having kids or getting married.
So .. the thing is, this is a descriptive account of the biology of the brain. However, I sometimes see the "discourse machine" building narratives around pushing the age of majority later, and I suspect this will get used in ammunition for normative purposes.
Anecdotally I’ve felt this shift over the past few years. I am 33 and have always been a huge proponent of personal growth, change, pushing yourself to be better. In the past few years Ive felt the opposite urge, an urge to accept myself, flaws and all, as the hand I’ve been dealt and I must merely play that hand, not focus so much on what-ifs, etc. Perhaps this is my brain solidifying.
As the authors mentioned, ~30 years is the age many people have kids, and it is already well known that female brain changes after giving birth, for example. The authors didn't research if being a parent can explain a part of the difference (and also if parent brains are any different than childless people brains).
I'm personally curious about this: I'm slightly above 30, I observed significant changes in my behavior recently... and I became a parent this year.
The stats warrant some caution, though. The main finding is based on figure 4 [1] and I wouldn't be surprised if the number and location of these 'eras' varied a lot if the authors use 40,000 people instead of 4,000.
I've always thought that I'm just extremely late to mature. I'm 36 now and haven't really felt like I sort of "get" things until my early 30s. My 20s were full of learning experiences, failures, and addiction to doing whatever the hell I wanted. I got a puppy with my wife at 29 and it felt like my life was over. This all really makes a lot of sense to me. It also makes me wonder why the human body rewards young parents when their brains are just simply not fully finished cooking. I couldn't have imagined raising a child at 22 with the way I acted and how important freedom was to me. I would've simply been a miserable father.
I do have felt similar shift around that age, but I wonder if it is due to reaching certain points in career where you are put into more leading position and have more confidence in what you do even if you don't have children? Easy to go into horoscope style confirmation bias here though.
Nonetheless I am never going to stop saying I still feel like I am 16. Just more confident 16.
It took me until my mid-30s to feel like I had crossed a threshold in processing grief and trauma from my late teen years. I was capable of adult behavior long before then, but my concept of the world and how I fit into it (or don't) was still childlike in many ways on a fundamental level.
Like most such things, I'd expect this to be a spectrum, and I may be somewhat of a late bloomer. Regardless, I have a theory that there is somewhat of a protective effect operating here. Believing in a simpler reality which involved future wish fulfillment for me - however unrealistic it was - may have helped me survive. Coming to acceptance of what I see as a more accurate but far bleaker perspective required me to grow strong enough to sustain my will to live despite that perspective.
Biggest lesson learned: I could not do it without at least one other person (or more) who I trust almost 100% with all of myself. Realizing that going it alone is futile is definitely part of what I consider becoming an adult, and it can take a long time to fully accept that.
Wasn't it 25 that the prefrontal cortex matured and people could be considered adults? We will have to infantilize people until their 30s now?
The problem with such reports (the studies themselves method-wise etc are in general fine I guess, but how the results are interpreted and disseminated is the issue) is that unless we find some specific correlations with behavioural and such measures, it makes no sense to give these kind of meanings such as "adolescence", adult mode", behavioural/mental/cognitive matureness or whatever cultural or other norms one may think a "mature/adult person" should abide to. Especially since these abstract topological measures, while interesting, are not that trivially linked with real outcomes in a causal sense, and instead of eg simply reflecting rather environmental or other changes in a person's life.
Yeah I could distinctly feel my brain shifting into its adult era over the last couple of years (I'm 31)
It was kind of odd. I'm more serious now (but at the same time.. less?). I'm way more easily able to focus on what actually matters in this life. (In saying that, I think it's more likely that my brain has finally decided what's important... in a way I feel like a passenger)
This is interesting and alarming to me because judging by the changes in my life I appear to have entered the age-66 phase more than a decade and a half early despite remaining intellectually curious and physically fit enough.
In the last year or so I have begun to adjust my life expectations. My father was in his nineties when he died, but I no longer believe I will reach my seventies.
Things like this only tend to confirm my sense that I am neurologically ageing at a rate that is unusual.
> based on the brain scans of nearly 4,000 people aged under one to 90, mapped neural connections and how they evolve during our lives.
That is an absurdly small sample size to make such a conclusion.
It seems this age range could at least partly be culturally attributed. In modern industrialized life, many people don't have to "grow up" until a later age. At the risk of generalizing, people have more support from family, friends, and society at large.
Is the forming of those neurons based on some natural law, or is that people just haven't had to live the experiences that do so until their 30's nowadays?
As far as I know, forming neurons isn't something that "just happens". It happens due to catalysts in life. In pre-modern society, and indeed most likely in under-industrialized nations today, those catalysts, those experiences, would happen earlier. As others mentioned, there is a clear correlation with the typical age in which modern society gets married, settles down, and has kids.
I wonder what that era age would have been 200+ years ago.
Then when you're not on the era you're supposed to be it's called a "regression" or "skipping stages". People are very stubborn to classify development in terms of age or time.
This study seems like finding a way to quantify the well known and then twisting it to make a good headline.
People don't grow up until they need to. Of course you're gonna see college educated rich westerners delay whatever mental markers you're looking at. And likewise people who "stay active" seem to stave off the mental decline of old age.
I don't know if it was adulhood, but after 30 I started feeling calmer & more adult than before.
There was no special event in my life that kickstarted this, it was tge beginning of a more mature way to look at things & people. I started to see some repeated events & behaviours that I had already experienced and this also contributed to have a more tempered way to manage things.
As you age of course you still face unknown things, but you star to see that supposed new things rhyme with things you already know.
>At around the age of 32 the strongest overall shift in trajectory is seen. Life events such as parenthood may play a role in some of the changes seen, although the research did not explicitly test this. “We know that women who give birth, their brain changes afterwards,” said Mousley. “It’s reasonable to assume that there could be a relationship between these milestones and what’s happening in the brain.”
>From 32 years, the brain architecture appears to stabilise compared with previous phases, corresponding with a “plateau in intelligence and personality” based on other studies. Brain regions also become more compartmentalised.
--
I felt this 32-year-old shift, but later (now 43). I joke with friends that I was a bone-head like most males until about 30. Joke yes, but feels right.
Prior to 30ish, I was more insecure. Lacking in emotional intelligence. My conclusions from my experience, not projections from what I've read about that time.
My career and relationship history reflect that switch-flip in a way. Only during the second half of my 30s did I begin to feel more secure and more confident in my career, despite not achieving some outrageous senior position or level of income. That career is now in a better and more measured place - in which I recognize what I do well and what I don't do well, and don't beat myself to a pulp for not having "it"
Only in my 30s did I robustly embrace the power of compromise in friendships and relationships. Now I'm near 10 years married (and happy, most of it, let's be real) with two wonderful kids.
And now I'm much capable of reasoning with my anxities, emotions, and insecurities. Do I still ruminate? Yes. Do I still react? Yes. But I know how to redraw situations to reset my in-moment feelings and/or avoid unecessary negative action.
I don’t know about any of this “era” stuff but I do know and believe in just how much becoming a parent has changed me. It completely overhauled the calculus on what’s important in life. It’s given me a very clear main quest line, relegating all kinds of things I used to think were important to the “side quests” category.
And it has had positive side effects too. It’s incredibly useful to be uninterested in promotions and raises. To want to work less, not be paid more. It makes it easy to say and do the right thing rather than the self-preserving thing or self-promoting thing. It’s kind of ironic because I think that makes me better at my job.
It’s quite calming to have such a clear identity. There really is a peacefulness to knowing, at all times, where my compass points.
I definitely felt older back in my early thirties, but I feel like I got younger now in my mid 40s. I think it's because my kid is in college and doesn't need me as much as they used to. Plus, I'm debt free and make enough money to not worry about the cost of going out.
In my late 20s/early 30s I was under water on my house, not getting paid enough, and had a small child. It was clear that I had to step up and "be a man." Which, I intuitively think had a bigger effect on me than simply getting older.
46 comments
[ 4.2 ms ] story [ 48.0 ms ] threadI just met up with my Brother-in-law and his friends for our yearly gathering. All of them are in their 30s and none of them are in what I would consider 'adult mode'.
They are all un-married/no kids, barely scraping by, partying every weekend/wasting money on weed and booze. Certainly no careers (mostly retail, some unemployed and still living with parents).
I wonder if these numbers will change with the new generation, because so many are not having kids or getting married.
I'm personally curious about this: I'm slightly above 30, I observed significant changes in my behavior recently... and I became a parent this year.
The stats warrant some caution, though. The main finding is based on figure 4 [1] and I wouldn't be surprised if the number and location of these 'eras' varied a lot if the authors use 40,000 people instead of 4,000.
[1] https://www.nature.com/articles/s41467-025-65974-8/figures/4
Probably so that they can grow with their children.
Nonetheless I am never going to stop saying I still feel like I am 16. Just more confident 16.
Like most such things, I'd expect this to be a spectrum, and I may be somewhat of a late bloomer. Regardless, I have a theory that there is somewhat of a protective effect operating here. Believing in a simpler reality which involved future wish fulfillment for me - however unrealistic it was - may have helped me survive. Coming to acceptance of what I see as a more accurate but far bleaker perspective required me to grow strong enough to sustain my will to live despite that perspective.
Biggest lesson learned: I could not do it without at least one other person (or more) who I trust almost 100% with all of myself. Realizing that going it alone is futile is definitely part of what I consider becoming an adult, and it can take a long time to fully accept that.
The problem with such reports (the studies themselves method-wise etc are in general fine I guess, but how the results are interpreted and disseminated is the issue) is that unless we find some specific correlations with behavioural and such measures, it makes no sense to give these kind of meanings such as "adolescence", adult mode", behavioural/mental/cognitive matureness or whatever cultural or other norms one may think a "mature/adult person" should abide to. Especially since these abstract topological measures, while interesting, are not that trivially linked with real outcomes in a causal sense, and instead of eg simply reflecting rather environmental or other changes in a person's life.
It was kind of odd. I'm more serious now (but at the same time.. less?). I'm way more easily able to focus on what actually matters in this life. (In saying that, I think it's more likely that my brain has finally decided what's important... in a way I feel like a passenger)
In the last year or so I have begun to adjust my life expectations. My father was in his nineties when he died, but I no longer believe I will reach my seventies.
Things like this only tend to confirm my sense that I am neurologically ageing at a rate that is unusual.
That is an absurdly small sample size to make such a conclusion.
It seems this age range could at least partly be culturally attributed. In modern industrialized life, many people don't have to "grow up" until a later age. At the risk of generalizing, people have more support from family, friends, and society at large.
Is the forming of those neurons based on some natural law, or is that people just haven't had to live the experiences that do so until their 30's nowadays?
As far as I know, forming neurons isn't something that "just happens". It happens due to catalysts in life. In pre-modern society, and indeed most likely in under-industrialized nations today, those catalysts, those experiences, would happen earlier. As others mentioned, there is a clear correlation with the typical age in which modern society gets married, settles down, and has kids.
I wonder what that era age would have been 200+ years ago.
Q: "Is this based on a clearly expressed scientific theory?"
A: "Be serious -- it's just an idea, a narrative."
Q: "What would constitute a basis for either statistical validation or falsification?"
A: "You're confusing psychology with science. That's naive."
People don't grow up until they need to. Of course you're gonna see college educated rich westerners delay whatever mental markers you're looking at. And likewise people who "stay active" seem to stave off the mental decline of old age.
There was no special event in my life that kickstarted this, it was tge beginning of a more mature way to look at things & people. I started to see some repeated events & behaviours that I had already experienced and this also contributed to have a more tempered way to manage things.
As you age of course you still face unknown things, but you star to see that supposed new things rhyme with things you already know.
>From 32 years, the brain architecture appears to stabilise compared with previous phases, corresponding with a “plateau in intelligence and personality” based on other studies. Brain regions also become more compartmentalised.
--
I felt this 32-year-old shift, but later (now 43). I joke with friends that I was a bone-head like most males until about 30. Joke yes, but feels right.
Prior to 30ish, I was more insecure. Lacking in emotional intelligence. My conclusions from my experience, not projections from what I've read about that time.
My career and relationship history reflect that switch-flip in a way. Only during the second half of my 30s did I begin to feel more secure and more confident in my career, despite not achieving some outrageous senior position or level of income. That career is now in a better and more measured place - in which I recognize what I do well and what I don't do well, and don't beat myself to a pulp for not having "it"
Only in my 30s did I robustly embrace the power of compromise in friendships and relationships. Now I'm near 10 years married (and happy, most of it, let's be real) with two wonderful kids.
And now I'm much capable of reasoning with my anxities, emotions, and insecurities. Do I still ruminate? Yes. Do I still react? Yes. But I know how to redraw situations to reset my in-moment feelings and/or avoid unecessary negative action.
And it has had positive side effects too. It’s incredibly useful to be uninterested in promotions and raises. To want to work less, not be paid more. It makes it easy to say and do the right thing rather than the self-preserving thing or self-promoting thing. It’s kind of ironic because I think that makes me better at my job.
It’s quite calming to have such a clear identity. There really is a peacefulness to knowing, at all times, where my compass points.
In my late 20s/early 30s I was under water on my house, not getting paid enough, and had a small child. It was clear that I had to step up and "be a man." Which, I intuitively think had a bigger effect on me than simply getting older.