Origami develops bi-hemispheric coordination of the brain and bi-manual dexterity in children and adults.
In other words, origami helps you maintain functional mental fitness at any age, and have fun doing it!
Check out these great articles by Katrin and Yury Shumakov on The Benefits of Origami.
You can also click here to read their Ph.D. thesis titled "Functional interhemispheric asymmetry of the brain in dynamics of bimanual activity in children 7-11 years old during origami training", Publishing house of the Rostov State University, 2000, 186 pp.