I don't agree. The only defensive players who can be considered "up there" are Rodney Harrison, Tedy Bruschi, and Junior Seau, none of which you can really say that their age is really showing through in their play. Harrison has not been his past self but that is most likely due to his injury, and there is reason to beleive his play will improve as his injury improves. Other than those three players, the rest of the defense is relatively young. Vince Wilfork, Richard Seymour, Ty Warren, Jarvis Green, Mike Wright, Rosevelt Colvin, Mike Vrabel, Tully Banta-Cain, Ellis Hobbs, Eugene Wilson, Asante Samuel, Artrell Hawkins, and James Sanders are all either in the prime of their careers or have yet to enter it. I agree the defense has not played particularly well but I don't think you can blame it on the players being old.