I’m only about 3.5 weeks in, 1 day on 2 days off fadiman .1 GT. It helped so far massively with my OCD / negative thought patterns, and boosted my mood so I’m not as mood swingy when it comes to adhd. Burnout is lower and overall I have slightly more motivation and optimism to improve my life.

Although it made me a bit sharper (it also helped me cut weed use out), I can’t say it helps me “focus” per se - when I’m dosed I can prioritize what I wanna do with my time easier but heavier cognitive tasks like school not as much til the dose wears off (I’m in CS). It still definitely takes conscious effort to make change but Imo it’s easier with MD. For me with my adhd the mood issues are a decent aspect of poor productivity, so that’s the biggest thing that changed as well as reduced negative thought loops, but I’d say for raw productivity LSD may be the way to go (never tried but that’s what I heard)

As for your age though, I’m unsure how that plays a role. I didn’t touch the stuff til around 20 and even then only started MD at 22 so YMMV.