I invite you to watch this recent video and browse the book. Alan Rusgridger learns Chopin Ballade no. 1 at age 57, 41 years after giving up the piano.
He managed to fit in practice while working as the editor of the Guardian newspaper. WOW!
As a drum student myself, it is always heartwarming to meet a fellow traveler For more info on my own journey in mid-life learning see my blog. Just click on this paragraph.