I've been playing since 1964ish on and off, mostly on now. I used to be able to take a tab and pretty much get it down in a day or two. Now at 66 it takes a week or more.
I have to admit though that lately I haven't been doing warmup stuff, just diving in to learning a tune and things get mixed up between stiff from not being warmed up and unfamiliar finger placements.
Even after all these years of playing, learning a new piece in super slow motion is still the best approach for me. Patience is the key and sometimes its in short supply
