Baseball Crank
Covering the Front and Back Pages of the Newspaper
March 14, 2006
BASEBALL: Age and EWSL, 2004-05 Combined

Revisiting a topic I looked at here and here following the 2004 season, I now have two years of data to work from in evaluating how players tend to perform at each age relative to their adjusted Established Win Shares Levels (EWSLs are explained here). I went back and broke out the totals for 2004 and 2005 into pitchers and non-pitchers. Here are the results, which you may find interesting but which I'm recording here mainly for reference as the backup for the revised age adjustments I'll be using for the 2006 EWSL:

Non-Pitchers:

Age#WSEWSL%
21-433340.878
2211204902.267
2313157112.4331.396
2428335261.5661.281
2546548437.81.252
2663664576.11.153
2768746744.8331.002
288611271031.2321.093
2974857943.80.908
3067779808.3660.964
3159588747.3660.787
3257554627.8330.882
3353568654.4330.868
3441386415.8330.928
35412783840.724
3626277353.3330.784
3724213301.1660.707
38141321630.810
39101271570.809
40+9601380.435

As I've explained before, the nature of any established performance level will exaggerate the upward and downward trajectory of player aging, since a 25-year-old is still being partly compared to his 22-year-old self, while a 35-year-old is still being partly compared to his 32-year-old self. Even so, the dramatic nature of the effects of aging is still apparent, as the rapid pace of improvement stalls out at 27, while the sharp downward spiral begins at 31 and never really lets up. And you can see, as well, how the results of this play out in the expanding and then contracting number of players of each age holding regular jobs.

The youngest age shows disappointments mainly because of guys like BJ Upton who get projected as possible contributors before the season and then stay the full year in the minors. The 40-year-old-and-up crowd looked much better in 2004 than 2005, because Barry Bonds joined their number with a huge raw EWSL and ran off the bridge.

Pitchers:

Age#WSEWSL%
21-523171.353
22119263.41.451
2317141138.931.015
2425170149.11.140
2534273218.631.249
2659376370.51.015
2758362388.660.931
2859415378.41.097
2954350401.7660.871
3043279310.130.800
31432613330.784
3243243353.80.687
3331180239.80.751
3425113157.1660.719
352178143.6660.543
361477930.828
3717123132.8330.926
3817126163.1660.772
391380106.8330.749
40+13146153.6660.950

If anything, the aging pattern on the pitchers is more severe, with the rapid growth phase ending by age 26 and steep decline setting in at 29. This is undoubtedly due in good part to injuries as well as to the number of pitchers who only have one decent run around the league. The 40+ pitchers, of course, include a disproportionate number of Clemens and Randy Johnson seasons, and may not be informative for lesser mortals even of the Tom Glavine variety.

One thing is clear, though: never, ever, ever underestimate the power of the tides of age over players in their 30s.

Posted by Baseball Crank at 8:26 PM | Baseball 2006 | Comments (3) | TrackBack (0)
Comments

The Bonds question that no one has answered yet, is: Just what has he found that the others have not?

Or perhaps, another question: Just what is it that makes some people (in this case, baseball players) so much better than their peers. Bonds, like Cobb, Mantle, Ruth, Mays and few others, these players rose far above their contemporaries. Are they so superior to start with, that an equal enhancement of Bonds made him so much better (however, much of the Bonds mystique is the amount of walks he took, which shows how much fear he did generate, also, perhaps how much over-exageration generated by that fear). If Mantle had juiced up as much (allegedly), would his numbers also be ever higher?

I don't know. The only athelete at that high a level I watched close up was John McEnroe. He was tuning up for the Open while I was playing with my coach (another story about pro sports, interesting, but for another time). He played two on one. The two was his doubles partner Peter Macnamara, and a teaching pro against Mac. I watched, and they were losing. Two pros against one, and Mac looked like he was moving in slow motion; almost not trying, yet he was winning. He was clearly a superior physical specimen. He had the uncanny abilitly to know where the shot three shots down the road was going to go, you could tell, plus he simply moved differently.Gretzky was like that. So was Magic Johnson. What could he have done had his speed been chemically enhanced?

Posted by: Daryl Rosenblatt at March 15, 2006 12:10 AM

I think the question is answered: He found a unique discipline for taking unprecedented amounts of steroids in combinations and cycles far beyond what anyone else was doing. Bonds pre-1999 was one of the best (maybe the best) players in baseball but he did not tower over the league the way he did from 1999-2004. Certainly he was one of a unique group before the doping began but he was not out on an island of singular greatness. Gretzky operated in a sphere unto his own that no one ever entered or has entered since (the next time someone wins 8 consecutive MVPs you let me know).

Posted by: jim at March 15, 2006 11:59 AM

I'm curious about one thing -- how do these numbers hold up if EWSL is normalized for 162 games? Or is it?

What I imagine is that both very young and aging players are going to play less than full seasons -- young players because they are more likely to be platooned; aging players because they get rest days, or go on the DL more often for minor injuries.

If normalized for 162 games, is the average decline as severe?

Posted by: Henry at March 15, 2006 9:28 PM
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