Olivo and catcher careers
This has come up in discussions regarding Olivo (who I would write at length about but do not have time), so I thought I would point everyone to this fine mini-study at Baseball Prospectus by the excellent Keith Woolner, which concludes
Catchers do not improve or maintain their rates of production into their late 20’s or early 30’s. There’s only the slightest tendency for catchers to have their peak season at ages 30 and 31 more often than other position players.
Overall, I don’t view the evidence as a strong trend for a later offensive peak. Perhaps we should abandon the idea of catchers developing more slowly, and recognize that the physical demands of the position will tend to reduce both the length of their peaks and the length of their careers.