@puzzleaddict, I haven't played for 26 years (I quit piano at age 22), so it will take a while for me to get my "aged and stiff" fingers back to the flexibility to play at that level again. :) The plus side is that with age, the motivation is there and I can practically remember all the drilling that my teacher drove into me in terms of practice technique and understand the reasoning behind the drilling and can pretty much get myself to that point through practice. Back then during the 70s and 80s, we didn't have online videos let alone the internet like we do now, so now I can always look up something on Youtube with regards to pedagogical piano technique if I am having a bit of a problem with a certain bit of technique such as how to attack a mordent which is prevalent in baroque music (which is the genre of music that I just absolutely love). As I said to @emorrill, I used to play Bach's Well-Tempered Clavier Prelude and Fugue in D Major, BWV 850.
My teacher wanted me to go at the speed that this recording went at: Stanislav Richter plays this recording.
https://youtu.be/K_85VWhfSRA
Let's just say, I got to about 85% of that speed.