2. They are Old
Athletes in every sport are playing longer and longer thanks to better medical help and an increased understanding and emphasizes on proper training and good living. That said athletes cannot perform at the top level forever and that is especially true for those competing in the brutally physical professional football. Peyton Manning is 39 years old, Tom Brady is 38 and Rodgers is 31. The first two have already lost what athleticism they had, while the most athletic of the bunch, Rodgers, will start to lose his dangerous ability to scramble. Go with youth.