Or is he? At the end the article mentions that Hall Of Fame RBs last about "10 years" longer according to the adjusted age scale. Since you can't know if a player is a hall of famer until after the fact, they don't include that as part of the age calculation. So, at worst this shows that his career is coming to a grinding halt, at best it shows that he's just heading downward on a steady decline (the second sounds better).