I was a mediocre blues lawyer player for a long time, and then I went to a guitar school in my 30s to attempt to get a real education in music. Sadly, I had a teacher who taught his own special scales and completely terrible picking and fretting technique. After about 2 months his training method ended up destroying my hands and caused a bone spur on my left (fretting hand) thumb so I had to stop.
After a short break, I ended up having to spend a few years completely changing my fretting hand usage to undo that teacher’s damage and my inspiration for how I fret was Django Reinhardt. I saw videos and photos of him playing with only two fingers, completely turned down the fretboard, and in a more fluid relaxed way. I started copying him and simply turning my hand while I play completely fixed it and helped a lot. I then started to notice that just about every professional guitarist in the world turns their hand when they really play because…spoiler alert! Hands are supposed to turn and flex and move around.
Now I can play 3 note per string pentatonics on a 30" scale guitar and move freely between any key and scale by just turning my hand. Before I couldn’t play a basic scale on a normal guitar without intense pain.
Troy’s curriculum has been doing the same thing for my picking hand. Again, I was told to always keep my pick flat to the strings, and as Troy shows in his videos that just doesn’t work. Seeing him turn his picking hand similar to how I turn my fretting hand and then practicing the pick slanting techniques has fixed my picking hand as well. My speed and accuracy is increasing but–most importantly–it’s much more ergonomic and causes a lot less stress.
The key is to practice small motions repetitively very slowly and stay relaxed. I didn’t even use a metronome in the beginning since I was going so slow it wouldn’t make a difference and the metronome adds stress which kills the natural relaxed feeling I was trying to have while playing. I get the motion for just 1 or 2 string patterns down very slowly so that it’s fluid and relaxed and I can do it without thinking, then I add a metronome at a low speed. I inch it up and when I start to stress I back it off and hang out there for a while until it’s again fluid and natural, then inch it up some more. It takes time, but constantly relaxing and going slow eventually makes the frustration go away.
Once I got to where I was able to keep up with a basic tempo I then just started practicing jamming to random genres of music. I use a TRIO+ to just goof off, but I’m kind of “road testing” the new technique, trying to keep using it while I play and find the tempos where I can do it successfully. Sometimes I just play a scale over the chords or even just a 2 string riff until I do it in the new style.
I should also add that I’m 45, and really the only thing age does is sets a harder limit on how fast I could possibly go. Doing the actual technique isn’t necessarily age dependent.
I hope that helps.