' 08 Furthermore , the NFL has already countered .
Numerous NFL rookies agree , that the overwhelming majority of 18 - to 21 - year - olds would not be able to compete immediately in the NFL .
' 08 Furthermore , the NFL has already countered , and numerous NFL rookies agree , that the overwhelming majority of 18 - to 21 - year - olds would not be able to compete immediately in the NFL .