There's some data in "Why productivity fades with age: The crime–genius connection" by Satoshi Kanazawa: http://personal.lse.ac.uk/Kanazawa/pdfs/JRP2003.pdf ht

There's some data in "Why productivity fades with age: The crime–genius connection" by Satoshi Kanazawa: http://personal.lse.ac.uk/Kanazawa/pdfs/JRP2003.pdf http://personal.lse.ac.uk/Kanazawa/pdfs/JRP2003.pdf