All the research I've read suggests that baseball hitters most often peak between 26 and 27, maintain close to that level until about 30, and then start to slowly decline. I've never seen any research that suggests that baseball hitters peak at 30, which is why I was curious about your source. I've never done any real scientific observations, but I've noticed looking at a lot of superstars career stats, their best seasons came between ages 30-33. (Sosa, Palmeiro, McGwire, among a few others I've just randomly looked at). LOL, I guess this was meant to be funny? well if it made you laugh i guess i'm happy.