Earlier quoted context omitted.
Hmm, interesting. I'm 39 and used to have amazing flow sessions in late 20s and early 30s but not seeing them much anymore. I can't tell if it's because of stresses of life or simply because I don't have enough time (with 3 young kids) to allow myself to fall into a state of flow. I really hope it's not stresses or my brain changing because I really valued those periods of focus.
Late 30's no kids, no stresses beyond the threat layoffs and still being single. I recently tried playing some video games adjacent to ones I've loved before, and I found it really hard to get into them. The games are Red Dead Redemption and SimCity 4, so the graphics and gameplay mechanics are ok. It's just been hard to really get into them.
Some exceptions in the past few years have been Zelda: breath of the wild and GTA V (yes, I know both of them are a bit older, but I only played them relatively recently).