Well there are certainly adult learners who aquire drastic change to their life, but for most of us we achieve a fixed state and plateaued our potential. For a

Well there are certainly adult learners who aquire drastic change to their life, but for most of us we achieve a fixed state and plateaued our potential. For a evolution point of view, when an animal reaches "reproduction maturity", it's aging torwards more and more useless and a matter of time been replaced by young ones.