Haha same. I think the problem is that it seems to hit you all at once. I was pretty open minded and go with the flow until at least my early 30s, now I hate any kind of change at all.
Re: video games, I had a similar experience but play for different reasons. I used to have fun blasting people and chatting on xbox live... don't enjoy any of that anymore. All single player for me, and no FPS. A cool physics game like Rocket League(admittedly, not single player), or a puzzle game like The Turing Test, or a mystery game like Kona are way more interesting to me than say, Call of Duty.
- I have mostly no joy playing video games anymore these days.
- I found myself refusing some contemporary stuff in favour of stuff "I am used to".
Damn! I was always looking at my dad, not understanding that very same things :) Now I am a dad myself...