I couldn’t agree with this writing more. It’s happening to me and I even crave it now. For example, I celebrate every time I miss another high school reunion. The 50th is next year for me and there is nothing or nobody that could drag me back to see people that I left behind decades ago. (see the last section).

I’ve got family within driving distance and I don’t text or call for fear that there might be a get-together that I’d have to suffer through. There just isn’t enough there for me to want to suffer through that anymore.

We all become more introverted as we get older, even the most extroverted among us.

I’m a classic introvert, but in my teens and twenties, it was normal for me to spend almost every weekend with friends. Now, in my thirties, the perfect weekend is one with zero social plans.

And I’m not the only one socializing less these days. My extroverted friend, for example, used to run through her entire contact list, calling friends whenever she was alone in the car. She told me she hated the quiet, the emptiness, because being alone felt boring.

You know, for the whole 10–15 minutes it took to drive to the grocery store. Oh, the horror.

These days, I can rarely get her out for brunch or coffee. She’s content spending most nights at home with her husband and two kids. And I haven’t gotten one of her infamous calls in years.

So, what gives? Do we get more introverted as we get older?

Probably, says Susan Cain, author of Quiet: The Power of Introverts in a World That Can’t Stop Talking — and this is actually a good thing. Let me explain.

Why We Become More Introverted With Age

In a post on Quiet Revolution, Susan Cain confirmed my suspicions: We tend to act more introverted as we get older. Psychologists call this “intrinsic maturation.” It means our personalities become more balanced, “like a kind of fine wine that mellows with age,” writes Cain.

Research also shows that our personalities do indeed change over time — and usually for the better. For instance, we become more emotionally stable, agreeable, and conscientious as we grow, with the largest change in agreeableness happening during our thirties and continuing to improve into our sixties. “Agreeableness” is one of the traits measured by the Big Five personality scale, and people high in this trait are warm, friendly, and optimistic.

We also become quieter and more self-contained, needing less “people time” and excitement to feel a sense of happiness.

Psychologists have observed intrinsic maturation in people worldwide, from Germany to the UK, Spain, the Czech Republic, and Turkey. And it’s not just humans; they’ve observed it in chimps and monkeys, too.

This shift is why we slow down as we get older and begin enjoying a quieter, calmer life — and yes, it happens to both introverts and extroverts.

Becoming More Introverted Is a Good Thing

From an evolutionary standpoint, becoming more introverted as we age makes sense — and it’s probably a good thing.

“High levels of extroversion probably help with mating, which is why most of us are at our most sociable during our teenage and young adult years,” writes Susan Cain.

In other words, being more extroverted when you’re young might help you form important social connections and, ultimately, find a life partner. (Cue the flashbacks to awkward high school dances and “welcome week” in college.)

Then, at least in theory, by the time we reach our 30s, we’ve committed to a life path and a long-term relationship. We may have kids, a job, a spouse, and a mortgage — our lives are stable. So it becomes less important to constantly branch out in new directions and meet new people.

(Note that I said “in theory.” In my 30s, I still don’t have kids, a mortgage, or a wedding ring. These days, we have the luxury of not following evolution’s “script.”)

“If the task of the first half of life is to put yourself out there, the task of the second half is to make sense of where you’ve been,” explains Cain.

During the married-with-children years, think of how difficult it would be to raise a family and nurture close relationships if you were constantly popping into the next party. Even if you don’t marry or have kids, it would be hard to focus on your career, health, and life goals if you were always hanging out with friends like you did in your teens and twenties.

Once an Introvert, Always an Introvert

But there’s a catch: Our personalities only change so much.

In my book, The Secret Lives of Introverts, I like to say that our personalities may evolve, but our temperaments remain constant.

This means that if you’re an introvert, you’ll always be an introvert, even at 90. And if you’re an extrovert — though you may slow down with age — you’ll always be an extrovert.

I’m talking big-picture here: who you are at your core.

Research supports this idea. In 2004, Harvard psychologists Jerome Kagan and Nancy Snidman studied individuals from infancy into adulthood. In one study, they exposed babies to unfamiliar stimuli and recorded their reactions. Some babies got upset, crying and flailing their arms and legs; these were labeled “highly reactive” to their environment.

Other babies remained calm around the new stimuli; they were the “low-reactive” ones.

When Kagan and Snidman checked in with these individuals later, they found that the “highly reactive” babies often grew up to be more cautious and reserved, while the “low-reactive” babies tended to stay sociable and daring as adults.

The bottom line? Our core temperament — whether cautious or sociable, introverted or extroverted — doesn’t change dramatically with age.

An Example: Your High School Reunion

Consider, for instance, your high school reunion.

Let’s say you were very introverted in high school — perhaps the third-most introverted person in your graduating class. Over the years, you’ve grown more confident, agreeable, and comfortable in your own skin, but you’ve also become a bit more introverted. If you enjoyed hanging out with friends once a week in high school, maybe now in your thirties, you’re content with seeing them only once a month.

At your ten-year high school reunion, you notice everyone has slowed down a bit, enjoying a calmer, more stable life. But those who were very extroverted in high school are still much more extroverted than you.

You’re still approximately the third-most introverted person in your class — but now the whole group has shifted slightly toward the introverted side.

And that’s not a bad thing. In fact, it might be exactly what we need to flourish as adults. If there’s one thing we introverts understand, it’s the deep satisfaction of a quiet life.

Have you found yourself becoming more introverted as you’ve gotten older? Let me know in the comments below.