It's probably worth noting that the guys who continued to produce at advanced age (Ortiz, Manny, Thome, Bonds) all had high walk rates like Bautista does. Thome and V-Mart are a little younger still, so we'll have to see how they do in the next year or two. I suspect guys like Bautista and Choo will age relatively well with the bat as long as they can stay on the field physically.