Just in case you missed this on PBS, this is some information on a teacher who received an award for being the best teacher in the WORLD! What makes her the best teacher? Because her model is based on allowing children to choose what they focus on based on their interests.
Imagine how our lives may have turned out differently if we could have had more choice in what we studied. But I guess, this is what retirement does - it may provide time and opportunity to learn the things you are drawn to.