Okay then, what's true? Heavy/fat players tend to really decline around age 30. He might have a few prime years left, but he is almost certainly not entering his prime. Considering Prince is already a bad baserunner and fielder, I'm scared what he's going to be like after age 30. 30 is a little early. prince's dad kind of leveled off through about 32-33 and then got bad quickly. john kruk was quite good through his age 32 season and then dropped off. mo vaughn dropped off after age 30, but his knees were fucked up (probably from being fat). david ortiz peaked at ages 29-31 (probably steroid-related) but was still quite good last season. i'd have no problem going 6 years with prince, taking him through his age 33 season. even if he drops off like ortiz/kruk in the last two years of his contract, you've probably still got an above-average hitter. hopefully you get enough in the first 4-5 years of the deal to make that last year or two not matter so much.