Size 12 shoe, 8.25" trucks, and my boards are 8.125" x 32" with a 14.25" WB.
I'm also in my late 30's, so I came of age in the 7.75" era. I took a few years off the board to chase all the bullshit they tell you to start chasing at a certain age (college, job, serious relationship), but at the end of all that running, I realized how much I missed skateboarding. A few years ago I took my old 7.75" out of my closet, reignited the flame, and then quickly found out how much bigger the boards had become. I eventually sized up to 8.25" but that felt like too much, so I went down to 8" only for that to feel like an overcorrection. So I got an 8.125", started landing kickflips, and stuck with that.
Everyone overthinks the details of every hobby. If you find something that works for you and it allows you to have the most fun, stick with it, and hope the #brands keep making it the way you like it. Also, shit could be worse: right now someone is thinking about buying a carbon fiber pickleball racket. I'm grateful that's not me.