Obviously different players age differently, but see my Beltran example above -- taking on his long-term contract around age 30 for any reasonable prospect haul (i.e. headlined by Wheeler or Berrios type) would have been a fantastic move for the acquiring team. Not without risk, of course, but the performance upside is plainly evident. Players on the "upswing" of their careers can be good, but they are less likely to actually swing up as high as even a fairly pessimistic Tulowitzki forecast, I think. I think people here are under-rating the value of demonstrated performance, even on a contract like Tulo's remaining deal. There's a reason the Rockies aren't trading him, and it's not because no one is willing to send them a Gibson or Berrios led package and take on the remaining salary. He's simply worth more than that. The Twins should walk away because the prospect haul becomes too great (i.e. that package plus Sano), not because of the money or the aging curves or his home/road splits.