From a soul perspective, the idea that learning would stop being a primary focus of our life after age 21 is a bit ridiculous.  As I often share, for the soul, there are 3 primary objectives to physical life - to create, to serve, and to grow (or learn).  All are innate within us and all are meant to be explored from the day we are born to the day we die.  (And, yes folks, learning keeps on going well beyond this life too so you might as well just enjoy the journey!)