As a older than this person, I feel like it’s around the time most people have that first large step of retrospectiveness where they see their current self has deviated from their self they thought they were previously. They realize they have autonomy to craft themselves. They realize there are more important aspects to life than their grades/sports/hobby or whatever things they built their identity around for the first 20-25 years. Anyways once you realize it, it’s an interesting topic to write about as you’ve become a completely different person from the one you were maybe 5-10 years prior. Because you’re likely transitioning into adulthood (maturity wise). As this continues in your later thirties and forties, it’s just status quo adulting and not as interesting to write about.

I always half-joke that I gave up on my hopes of being a child prodigy when I turned 30.

That was a major milestone not just for realizing that there was no future "grown up" version of me, but also seeing how much time had passed and how little was left. So I accepted that who I am is who I'm going to be, for the most part, and I might as well make the best of it. That opened up a lot of doors for personal interest that I hadn't even noticed previously.

So predictably I started woodworking.

This is good, and I'll add that for the kind of person who grew up sitting in front of a computer and is now working full-time sitting in front of a computer, this is most likely to manifest in recognizing problems with physical health and taking steps to fix it, steps that are tangible and highly achievable for someone in their 20s and 30s.

EDIT: Oh, and farmers do not have this particular problem, lol

Precisely this. For all the (woefully young) science about brain development and maturity, it doesn't seem to stop for quite a while, and my late 20's and early 30's have been the most interesting time of reflection and self-appraisement I've had.

It's becoming clear to me that what we call a "mid-life crisis" is probably just Jung's self-actualization, where a person becomes aware they've been wearing a mask to some degree until then. It seems most people find a way to drop it, stop doing what they don't want, and start doing what they do want. Hence the development of grumpiness, divorces, moving far afield, buying sports cars, becoming ascetics, whatever it is that reflects a truer identity than their young selves that satisfied expectations and chased approval.

I've found that the people I know who naturally reject molds and masks while young and pursue what they want early on don't seem to go through this.