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A Carlos Pena career path is very similar to a Jay Buhner career path. Just to add some perspective. Buhner played until age 36 Pena is 34 and not likely to last much longer. Assuming that Pena's feeble .238 career average won't withstand age-loss at the plate.
Age 26 to 29 seasons.
Pena .256/.366/.532 136 OPS+
Buhner .259/.360/.478 126 OPS+
Pena had one monster season at age 29, it's the only reason he has a slight edge over Buhner.