- 12 Tips for Memorizing Piano Music
- Thoughts on Memorization: A Skill Integral to Piano Playing?
- Practicing, Learning, and Memorizing for Piano Teachers (the diversity of comments are also instructive)
Also take a look at chapters 13-15 in the 31 Days to Better Practicing ebook for my own ideas on the subject.
But there's another thing I've also noticed about older pianists - sight reading gets easier and more natural. Whereas young students generally tend to need poking, prodding, inspiration, and constant reminders to work on their sight reading, older learners often develop this skill without any undue effort. Could it be that the brain as it ages tends to de-emphasize memory accuracy in exchange for better visual processing?