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Superstars do tend to age better than normal players though. Ichiro was Ichiro until age 36. Arod's first contract was bashed around baseball, but actually ended up being a nice bargain. Its his second contract that has been troublesome.
Fielder is young enough that I can see the logic in signing him if the years and terms aren't rediculous. That said, the Ms need to figure out the other positions on the field with prospects/trades before they dig in.