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Average WAR by Age, 1980s

Posted by John Autin

Here's my second pass at this study, using a different and larger time span (1980s), a lower threshold of inclusion (min. 140 PAs), and excluding first-year players. Once again, this is for position players only.
























This graph shows an earlier and broader peak, from age 24-27, with odd spikes at 30 and 33.

I welcome your observations & suggestions.

Notes:

  • Each age group had between 155 and 319 players.
  • "WAR/650 PA" is based on the combined raw totals of WAR and PAs for each age group, then expressed per 650 PAs. This minimizes the impact of performance outliers with low PAs.
  • "Avg. WAR" is the unweighted average of the individual WAR totals for each age group. Each player has equal weight in this figure, no matter how much he played.
Data table:

Age
WAR/650 PA
Avg. War
Avg. PA
--23
2.18
1.45
433
24
2.43
1.59
424
25
2.45
1.61
428
26
2.40
1.59
430
27
2.36
1.58
437
28
2.21
1.41
414
29
2.12
1.38
425
30
2.33
1.49
418
31
2.03
1.29
413
32
2.06
1.28
404
33
2.31
1.54
435
34-35
1.82
1.11
398
36-up
1.43
0.86
390

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