You live, and you grow, and you change. At some point you realize you’re an adult (for me, around age 25). You feel at that point you are not going to change anymore, although it still remains difficult to imagine yourself as middle-aged (and forget about “old”).

You feel “done” maturing, as if at 25 (or whenever) you will simply lock into place and be the “you” that you are now for the rest of your life.

There’s some anecdotal truths around this. For example, artistic tastes. I believe they tend to form as part of childhood and adolescence, and of course one’s taste matures and is refined by experience. But at some point, usually late adolescence, you have kind of “decided” what kind of art, music, film, philosophy, etc., that you “like” or identify with, and this gets rather chiseled in stone for many people. This is why, for example, Journey and Foreigner are still touring.

(Artists are an exception. They are always looking for the new. But given enough time, even they may lose their taste for the now.)

We’re amazed at how richly detailed our childhood memories are, our adolescent and post-adolescent memories. The time between age 6 and 21 seems a lifetime in itself, a kaleidoscope of change, when recollected at age 50. But the time after that, and all the way up to the present, seems a fleeting moment, punctuated by memories of only the most obvious junctures of change (career start, marriage, children, deaths of relatives, new job, big vacation, etc.). Personally, I can barely remember anything that happened between age 25 and 35, but I have a huge catalog of incredibly distinct memories from childhood and adolescence.

Science now has good evidence that there is a reason we have such vivid memories of childhood and adolescence—our brains are wired to create more permanent memories during these years. It would seem to go hand in hand with our greater ability to learn at a younger age.

And, as science has also proven, as you get older time does literally move faster. At least from the individual’s perspective. Gyp!

I’ve also noticed that physical aging is not a steady degrading of one’s appearance from “youthful” to “codger.” It’s a process with fits and starts. Nature, in her wisdom, seems to be most “interested” in us between the ages of 12 and 40. This makes perfect evolutionary sense if you think about it. And so, I don’t know if it’s by design or just a function of human aging, but it seems I did not age at all, physically, between age 20 and 40. I remember, when I was about 31, I walked into my first college class as an instructor. Some of the students laughed, and as I took my spot at the podium and smiled at them, some of them told me to quit fooling around and get a seat before the instructor arrived. I looked about the same as I did at 18. They ended up being a good class. (And that’s another thing – youth relates to youth. It’s not fair. A lot of things aren’t.)

Why this variability in physical aging, memory creation, and perception of time? I believe it’s because Nature has great use for us between the ages of 12 and 40 – to create and raise the next generation. I’m not saying that’s anyone’s “duty” by a long shot. Every life is valid. I mean that that is our usefulness to Nature, which is insistent that life will succeed, and indifferent to what happens after we help in that task. It is our “golden” time, the time when we are most vital, most animated, and most attractive. It’s all useful to be thus, in terms of evolutionary success. And when we get past that period, we are, I’m afraid, no longer so useful to Nature. We are free to stick around, perhaps to advise, but we’re largely relegated to being observers in the continuous cycle, the generational game that is center stage.

And then, when we aren’t looking, the fun begins.

There used to be an old joke about how when Dick Clark reached age 75 he was going to age all at once. Yeah, he was youthful for a long time. But then he wasn’t. And many are, as I was, slow to age. But to quote my old bud Robert Frost: Nothing gold can stay. Time is, as they say, the great destroyer. Or, if you’re a Jim Morrison fan: No one here gets out alive.

So now I do age. My face is fatter, my hair is thinner and coarser and grayer. My middle is more of me. My skin was perfect, now I’ve got more “character” in my face. I have a crown on what used to be a molar. I’m allergic to everything. My eyes are less bright and can’t see menus in dim restaurants. My body is, in general, less cooperative than it used to be. And I’ll be honest, it gets to me sometimes. All things being equal, it’s better to be young, healthy and beautiful. Right? Sure.

But all things are not equal.

Lately, I have felt a very odd transformation occurring. I can only describe it as being less “me” and more “us”. For my entire life, and largely based on my lifestyle, I’ve been a loner, even an outcast. It was always “me” and “everyone else.” It felt right, it felt safe and contained, and my personal philosophy had a lot to do with the idea of the “sovereign individual,” beholden to no one, bowing to no creed and no nation. I was (and am) a devotee of that famous iconoclast William Blake’s iconic statement: “I must create my own system, or be enslav’d by another man’s.”

That’s changed, at least in part. I would like to say it changed the day I married, but that would be dishonest. I was 28, still in Nature’s grip. I was not done figuring out who and why I am. I had a long way to go, and perhaps that was mutual. I suspect it was, and that’s fine. Nothing important is easy, nothing valuable happens in a moment (well, a couple of things). Building a life – an identity – I find it’s a lifelong process. And once I had decided upon my identity, way back then, it felt sound, but now it has shifted again.

Marriage is complicated, as the divorce and single-parent statistics attest. It’s not always worth it. And, most of all, the future – and our future selves – cannot be predicted, they will come to pass as they do, not as we will them to. So some fail. Marriage is a planned sacrifice of sorts, a giving up (eventually, if the union is successful) of a part of oneself, in order to accept being part of another self. I didn’t really understand this when our drunk minister, Reverend Fred, said the words in October 1990, that we were now “one.” I thought I did, but I didn’t.

Now I do. And not only do I feel I am truly not one person anymore, I’m not even limited to being two people. I can look at my daughter now, hear her words, witness her mature identity growing, and it grows like the acorn into a replica of the old oak. Really. She is a true part of the “us” that we are now, and there’s no competition regarding whom she is “more” like, because in a rather profound way we all seem to be the same person. Of course we are physically independent beings, with as much free will as anyone may have (or think they have). We have our own likes and dislikes, etc. But we do not go it alone, not at all. We are “in it” together, the “it” being life. We share it, as I have never before understood sharing.

No, it’s not readily explained.

But I know this: I’m no longer me, and it’s no longer me against the world. I’m us, and we’re us. And we are a world, within a world. And it feels better than anything I’ve ever felt before.