I realize this is a broad question, but my life has changed drastically in the last few months, and I'm looking to experience more before I get too old. I know the usual answers like getting married, having kids, and so on.
I'm more interested in skills, hobbies, fields of education, practices, habits, and experiences that have shaped (for the better) the person you are today.
I think I consider myself a jack of all trades, but master of none. I guess I mean I pursue knowledge in whatever endeavor I'm interested in at any given time, rather than devoting all my energies to master a single skill set. So now as an old guy, I know a little bit about many things. I don't pretend to be an expert in most, but it's great when you have a well rounded knowledge in a variety of areas.
Example: I'm basically an electronics guy ... so when computers were new and novel, I built my own from components. Then I had to figure out the software, which was anything but user friendly back when. In the process I learned the functions of most things electronically, and though I'm not a software guy, I grasp the basics. For me it's the same with cars, guns, you name it ... when I got the bug to do something, I put the effort into learning as much as I needed to learn to be proficient. So me ... I think that's the key ... you need something done or wanna do something, educate yourself on the subject. Eventually you know a little bit about everything from plumbing to physics ... and people think you're smarter than you really are - LOL.