Man, what a question.
So much has changed for me, too. Got married, lost my father, bought a house, had a great paying job that led to a lot of complacency, worked in the game journalism (lol) profession, became a critical essayist, had numerous eye surgeries, learned how to control my diabetes, got a really good job with incredible benefits, encouraged my wife to go to school to get her PhD, decided guinea pigs are the only caged animals worth owning, and a whole lot more.
But I think that the most important thing for me is that I learned that you don't have to die on every hill. At the end of the day, no matter how well reasoned out your arguments may be, you'll come upon an opposing view that you can't knock down
All conflict is like this; live by the sword, die by the sword. Eventually, someone with better steel will come along. Even if you win, someone who knows how to use their steel better than you will come along. Even if you win, someone with better steel AND better skill will come along. And the more hills you fight over the more you expose yourself to contradictory arguments. It's analogous to aging: eventually, your ideas lose their vigor and you mature enough to realize that fighting 'everything' just doesn't matter.
I also learned that just because people say things I don't agree with isn't grounds to try and destroy them and shut down dialogue. In principle, I really hate the idea that a person can never contribute just because they said or did one stupid thing once. Obviously, it's contextual and based on the severity of the attempted offense.
Example: Lonesage said 'Casca enjoyed getting raped,' which proves he doesn't know shit about Berserk. Ten years ago, I'd have died on that hill. But now? What does it matter? 'sage has lived in another country and has a unique set of experiences and perspectives that make him eminently worth following here.
I generally don't shut down conversations. Biggest evolution of myself as a person here.
Even Saner says things that aren't completely fucked up and stupid once in a while.