Is there a good book about techniques for learning in maturity?
For example from a Jungian-oriented perspective on "the afternoon of life," you could say that the tension between opposites is reduced, so you can finally start to look at combining opposites that you had previously thought were required to work separately. Putting the weapons down and putting ideals back in the front seat.
One might explore becoming a Windows + Linux person for example.
Or becoming more aware of intertwining logical and emotional perspectives on a given topic...maybe one "just likes" using Photoshop even though it is the only thing keeping them on their old Mac. Still, logically it doesn't make sense in some ways, so they pick up a Chromebook for the day-to-day web stuff.
This can be related back to everything in one's life, from learning about relationships to programming language dynamics to new fitness skills. The old opposites want to make war. But how can they work together to create a new, improved, third point of progress?
And that's just one of thousands of different techniques relevant to aging...for this reason it can help to look at broader surveys on aging, be they books, Youtube videos, blogs, etc., and kind of mentally check off techniques that can apply to learning as you come across them. The best techniques for a given individual are generally found spread across many sources, and sometimes those sources are surprisingly not at all "about" learning.
IMO it's a great idea to keep a log of one's aging process, as well.