I'm not sure why you're getting hung up on DD's age. So what if he's near the oldest in the league if he's still playing at a high level. He played at an All-Pro level this year and while he's probably lost a step from his peak, he's still very effective and probably has at least another of not 2 more seasons producing at a high level. Even if he loses another half a step, he's still going to be better than most in his position. It's not something we'll need to worry too much about for another year at least.