Weird that you take that approach since lower strikeout numbers do correlate to batting average and have mild correlation to walk rates. Peak aging curve is also more along the lines of 28-29. Not sure where you got the 93.7% figure.
First, look at the numbers I posted on Maybin's SO rate and tell me where he significantly lowered it.
Because Maybin has not significantly lowered his SO Rate, we have not seen any change in his BB Rate or BAVG.
http://www.fangraphs.com/blogs/index.php/hitters-age-like-wine-power-like-cheese/
http://www.baseballprospectus.com/article.php?articleid=9933
http://sports.espn.go.com/fantasy/baseball/flb/story?page=age27myth
http://www.indranet.org/frontal-lobes-development-and-technology-use/
A person's frontal lobe fully develops around age 25 and tracks with the commonly assumed peak years being from 26-30 (26-32). 26 is supposed to be the age the physical and mental peak. From that point on, the physical declines. As a rule, minor league players are no longer considered a "prospect" past the age of 25.
When I say we know what they are at 26, is they are at their peak physical and mental, combined. After 25, it is almost impossible to teach them something different (i.e. take a walk). Occasionally, a player will have a "fluke" season (I can explain what constitutes a "fluke" season later). Also, sometimes "fluke" seasons are rookie seasons (Listach)
2000 Darin Erstad (26)
1986 Steve Sax (26)
1996 Brady Anderson (32)
2001 Luis Gonzalez (33)
Now, each study has/had different criteria as to how they calculated peak years. How do you include a player that doesn't make the majors until age 27 or 28? What happens with the players that are gone from baseball by age 26, 27 or 28? Are they included?
Most studies focuses only on players that played in the majors from ages 24 to age 32 and beyond. And then figured out their peak years. This is great for that group. But it doesn't tell you the whole picture.
Try to explain the careers of Curt Blefary, Joe Charboneau, Ben Grieve, Angel Berrora, Pat Listach, Jerome Walton and Earl Williams.
For the Tigers, it would be players like Matt Nokes, Darnell Coles. Chris Shelton, etc.
A MLB season = about 26 weeks
.333 = 200 hits
.300 = 180 hits
.267 = 160 hits
The difference between a .300 hitter and a .267 hitter, is less than a hit per week.
I regress.....anyways....I did my own calculations. I included players from 1945 - 2011. Players had to be active from ages 24 to 32. I used Linear Weights as the value. Peak year was at age 26-27 from this group. Less than 10% change for most players from year to year, which was (drum roll please)....93.7% of these players.
Seriously, if you are trying to compute peak years, but neglect players that did not play after 26, then your peak years is going to be higher than 26. And you include players that make it after age 27.