I have an article up on aging at Baseball Prospectus today.
How Do Baseball Players Age? Investigating the Age-27 Theory
Recently, there’s been a decent amount of chatter regarding how baseball players age, and I have to admit that it’s mostly my fault. In a study that was recently published in Journal of Sports Sciences, I find that players tend to peak around the age of 29; this finding has been met with resistance from some individuals in the sabermetric community, where 27 has long been considered the age when players peak. Will Carroll and Christina Kahrl graciously asked if I would be willing to defend my findings on Baseball Prospectus. I agreed, and I thank Will and Christina for the opportunity to do so.