Has Anyone Aged as Well As
Barry Bonds?
 
by Cyril Morong
 
 
 
Just about every fan knows that Barry Bonds has set some great records recently. And many fans are aware that he did it at a relatively old age for baseball players. So Bonds has, of course, performed better from age 36 to age 39 than he did when he was younger. How unusual is this and has anyone else shown a similar kind of improvement?
 
To look into this, I consulted the Lee Sinins Sabermetric Encyclopedia. I found all the players who had at least 1000 or more plate appearances from ages 36-39 and also 4000 or more plate appearances before age 36 (there were 176 such players). Then I looked to see how each player’s stats at the older age compared to their stats at the younger age. Stats looked at were slugging percentage (SLG), isolated power (ISO), homerun percentage (HRs per 100 at-bats or HR%), and offensive winning percentage. The last stat is one invented by Bill James. From the Lee Sinins Sabermetric Encyclopedia “It's a Bill James stat that projects what a team's winning percentage would be if each offensive player was cloned to that player and the team had an average pitching staff.” So it is adjusted for the league average of a player’s era (and is park adjusted as well). Also, the first three stats, SLG, ISO and HR% were rated relative to the league average for each player’s era.
 
Let’s start with slugging percentage (SLG), which is total bases divided by at-bats. Each player’s SLG relative to the league average was found for before age 36 and from 36-39. SLG relative to the league average is referred to as “Rate” in the tables used. For example, in the table below, Bonds has a Rate of 139 under the age of 36. That means his SLG was 39% above the league average. The table below shows the top 25 players in terms of their improvement in Rate or SLG relative to the league average. From 36-39, Bonds had a Rate of 187. The Ratio column is the 187/139, which equals 1.35. This means that Bonds increased his rate by 35%, much more than any other player. The league column shows the league average. The average ratio is .93, meaning that the average drop off in relative SLG was 7%. So while the typical player who can even keep playing past 35 saw a 7% drop, Bonds saw a 35% gain.
 
| PLAYER | Rate <36 | SLG | LEAGUE | Rate 36-39 | SLG | LEAGUE | Ratio | 
| Barry
  Bonds | 139 | 0.567 | 0.409 | 187 | 0.809 | 0.433 | 1.35 | 
| Dummy Hoy | 95 | 0.362 | 0.382 | 109 | 0.405 | 0.372 | 1.15 | 
| Luke
  Appling | 97 | 0.403 | 0.415 | 109 | 0.398 | 0.366 | 1.12 | 
| Eddie
  Joost | 93 | 0.359 | 0.384 | 104 | 0.402 | 0.386 | 1.12 | 
| Cy
  Williams | 120 | 0.447 | 0.371 | 132 | 0.535 | 0.406 | 1.10 | 
| Hank
  Aaron | 140 | 0.563 | 0.402 | 154 | 0.599 | 0.390 | 1.10 | 
| Kid
  Gleason | 85 | 0.322 | 0.379 | 93 | 0.316 | 0.340 | 1.09 | 
| Mickey
  Vernon | 108 | 0.418 | 0.388 | 118 | 0.470 | 0.396 | 1.09 | 
| Andres
  Galarraga | 121 | 0.486 | 0.402 | 132 | 0.571 | 0.431 | 1.09 | 
| Lou
  Whitaker | 105 | 0.419 | 0.398 | 114 | 0.481 | 0.422 | 1.09 | 
| Darrell
  Evans | 108 | 0.419 | 0.387 | 117 | 0.470 | 0.400 | 1.08 | 
| Marquis
  Grissom | 98 | 0.410 | 0.420 | 106 | 0.460 | 0.434 | 1.08 | 
| Brian
  Downing | 105 | 0.413 | 0.393 | 113 | 0.451 | 0.399 | 1.08 | 
| Mark
  McLemore | 79 | 0.334 | 0.425 | 85 | 0.366 | 0.429 | 1.08 | 
| Bill
  Bruton | 93 | 0.390 | 0.418 | 100 | 0.401 | 0.401 | 1.08 | 
| Ozzie
  Smith | 83 | 0.321 | 0.389 | 88 | 0.354 | 0.401 | 1.06 | 
| Lave
  Cross | 103 | 0.393 | 0.381 | 109 | 0.377 | 0.347 | 1.06 | 
| Doc
  Cramer | 92 | 0.385 | 0.421 | 97 | 0.352 | 0.362 | 1.05 | 
| Tony
  Fernandez | 97 | 0.392 | 0.403 | 102 | 0.445 | 0.436 | 1.05 | 
| Ron
  Fairly | 104 | 0.405 | 0.389 | 109 | 0.427 | 0.391 | 1.05 | 
| Gary
  Gaetti | 106 | 0.427 | 0.401 | 111 | 0.472 | 0.425 | 1.05 | 
| Steve
  Finley | 106 | 0.440 | 0.415 | 111 | 0.481 | 0.433 | 1.05 | 
| Luis
  Aparicio | 87 | 0.342 | 0.392 | 91 | 0.343 | 0.378 | 1.05 | 
| Patsy
  Donovan | 94 | 0.361 | 0.383 | 98 | 0.338 | 0.345 | 1.04 | 
| Joe
  Adcock | 118 | 0.487 | 0.414 | 122 | 0.473 | 0.389 | 1.03 | 
 
 
Below are simply the top 10 relative SLGs for players aged 36-39, regardless of how much they improved.
 
| PLAYER | Rate | SLG | LEAGUE | 
| Barry
  Bonds | 187 | 0.809 | 0.433 | 
| Ted
  Williams | 163 | 0.654 | 0.400 | 
| Hank
  Aaron | 154 | 0.599 | 0.390 | 
| Babe Ruth | 152 | 0.628 | 0.412 | 
| Willie
  Stargell | 135 | 0.527 | 0.390 | 
| Cy
  Williams | 132 | 0.535 | 0.406 | 
| Andres
  Galarraga | 132 | 0.571 | 0.431 | 
| Norm Cash | 128 | 0.476 | 0.371 | 
| Bob
  Johnson | 127 | 0.454 | 0.359 | 
| Stan
  Musial | 126 | 0.524 | 0.415 | 
 
Now let’s turn to isolated power (ISO). This is SLG minus batting average and gives a measure of extra base power. Below are the top 25 in terms of the percentage improvement in Rate. The average ratio here was .88, meaning that the average player lost 12% in terms of relative ISO.
 
| PLAYER | Rate <36 | ISO | LEAGUE | Rate 36-39 | ISO | LEAGUE | Ratio | 
| Dummy Hoy | 79 | 0.080 | 0.101 | 117 | 0.103 | 0.088 | 1.48 | 
| Barry
  Bonds | 194 | 0.278 | 0.143 | 279 | 0.460 | 0.165 | 1.44 | 
| Mark
  McLemore | 49 | 0.076 | 0.155 | 64 | 0.104 | 0.162 | 1.31 | 
| Kid
  Gleason | 59 | 0.056 | 0.095 | 77 | 0.059 | 0.077 | 1.31 | 
| Hank
  Aaron | 181 | 0.250 | 0.138 | 234 | 0.301 | 0.128 | 1.29 | 
| Mickey
  Vernon | 110 | 0.132 | 0.120 | 137 | 0.179 | 0.131 | 1.25 | 
| Eddie
  Joost | 105 | 0.121 | 0.116 | 128 | 0.157 | 0.123 | 1.22 | 
| Brian
  Downing | 112 | 0.147 | 0.131 | 134 | 0.184 | 0.137 | 1.20 | 
| Bill
  Bruton | 78 | 0.117 | 0.150 | 92 | 0.132 | 0.143 | 1.18 | 
| Ron
  Fairly | 108 | 0.139 | 0.128 | 126 | 0.160 | 0.127 | 1.17 | 
| Darrell
  Evans | 137 | 0.168 | 0.123 | 159 | 0.220 | 0.138 | 1.16 | 
| Lou
  Whitaker | 107 | 0.145 | 0.135 | 123 | 0.187 | 0.152 | 1.15 | 
| Sparky
  Adams | 54 | 0.066 | 0.123 | 61 | 0.069 | 0.113 | 1.13 | 
| Doc
  Cramer | 62 | 0.083 | 0.134 | 70 | 0.069 | 0.099 | 1.13 | 
| Ken
  GriffeySr. | 102 | 0.130 | 0.128 | 115 | 0.157 | 0.136 | 1.13 | 
| Cy
  Williams | 169 | 0.162 | 0.096 | 190 | 0.219 | 0.115 | 1.12 | 
| Norm Cash | 161 | 0.218 | 0.135 | 181 | 0.212 | 0.118 | 1.12 | 
| Marquis
  Grissom | 92 | 0.139 | 0.151 | 103 | 0.170 | 0.165 | 1.12 | 
| Andres
  Galarraga | 146 | 0.201 | 0.138 | 163 | 0.262 | 0.160 | 1.12 | 
| Tony
  Gwynn | 85 | 0.113 | 0.132 | 94 | 0.148 | 0.157 | 1.11 | 
| Jake
  Daubert | 100 | 0.089 | 0.089 | 110 | 0.120 | 0.109 | 1.10 | 
| Joe
  Adcock | 142 | 0.207 | 0.146 | 156 | 0.214 | 0.137 | 1.10 | 
| Steve
  Finley | 112 | 0.165 | 0.147 | 122 | 0.201 | 0.165 | 1.09 | 
| Tony
  Phillips | 81 | 0.112 | 0.138 | 88 | 0.141 | 0.160 | 1.09 | 
| Gary
  Gaetti | 125 | 0.173 | 0.138 | 133 | 0.206 | 0.155 | 1.06 | 
 
 
Now Bonds only comes in second place here. But he does come in first in ISO if we look at a player’s ISO minus the league average ISO instead of ratios. Here, Bonds is far ahead of anyone else. Under 36, Bonds’ ISO was .135 better than the league average. From 36-39, he was .295 better. So that is an improvement of .160, which is the DIFF column.
 
 
| PLAYER | DIFF <36 | ISO | LEAGUE | DIFF 36-39 | ISO | LEAGUE | DIFF | 
| Barry
  Bonds | 0.135 | 0.278 | 0.143 | 0.295 | 0.460 | 0.165 | 0.160 | 
| Hank
  Aaron | 0.112 | 0.250 | 0.138 | 0.173 | 0.301 | 0.128 | 0.061 | 
| Andres
  Galarraga | 0.063 | 0.201 | 0.138 | 0.102 | 0.262 | 0.160 | 0.039 | 
| Cy
  Williams | 0.066 | 0.162 | 0.096 | 0.104 | 0.219 | 0.115 | 0.038 | 
| Darrell
  Evans | 0.045 | 0.168 | 0.123 | 0.082 | 0.220 | 0.138 | 0.037 | 
| Dummy Hoy | -0.021 | 0.080 | 0.101 | 0.015 | 0.103 | 0.088 | 0.036 | 
| Mickey
  Vernon | 0.012 | 0.132 | 0.120 | 0.048 | 0.179 | 0.131 | 0.036 | 
| Brian
  Downing | 0.016 | 0.147 | 0.131 | 0.047 | 0.184 | 0.137 | 0.031 | 
| Eddie
  Joost | 0.005 | 0.121 | 0.116 | 0.034 | 0.157 | 0.123 | 0.029 | 
| Lou
  Whitaker | 0.010 | 0.145 | 0.135 | 0.035 | 0.187 | 0.152 | 0.025 | 
| Bill Bruton | -0.033 | 0.117 | 0.150 | -0.011 | 0.132 | 0.143 | 0.022 | 
| Ron
  Fairly | 0.011 | 0.139 | 0.128 | 0.033 | 0.160 | 0.127 | 0.022 | 
| Doc
  Cramer | -0.051 | 0.083 | 0.134 | -0.030 | 0.069 | 0.099 | 0.021 | 
| Kid
  Gleason | -0.039 | 0.056 | 0.095 | -0.018 | 0.059 | 0.077 | 0.021 | 
| Mark
  McLemore | -0.079 | 0.076 | 0.155 | -0.058 | 0.104 | 0.162 | 0.021 | 
| Ken
  GriffeySr. | 0.002 | 0.130 | 0.128 | 0.021 | 0.157 | 0.136 | 0.019 | 
| Rafael
  Palmeiro | 0.073 | 0.220 | 0.147 | 0.092 | 0.254 | 0.162 | 0.019 | 
| Steve
  Finley | 0.018 | 0.165 | 0.147 | 0.036 | 0.201 | 0.165 | 0.018 | 
| Marquis
  Grissom | -0.012 | 0.139 | 0.151 | 0.005 | 0.170 | 0.165 | 0.017 | 
| Gary
  Gaetti | 0.035 | 0.173 | 0.138 | 0.051 | 0.206 | 0.155 | 0.016 | 
| Joe
  Adcock | 0.061 | 0.207 | 0.146 | 0.077 | 0.214 | 0.137 | 0.016 | 
| Sparky
  Adams | -0.057 | 0.066 | 0.123 | -0.044 | 0.069 | 0.113 | 0.013 | 
| Edgar
  Martinez | 0.056 | 0.203 | 0.147 | 0.068 | 0.232 | 0.164 | 0.012 | 
| Norm Cash | 0.083 | 0.218 | 0.135 | 0.094 | 0.212 | 0.118 | 0.011 | 
| Luke
  Appling | -0.039 | 0.092 | 0.131 | -0.028 | 0.078 | 0.106 | 0.011 | 
 
Below are the top 10 ISOs relative to the league average for ages 36-39, regardless of improvement.
 
| PLAYER | RATE | ISO | LEAGUE | 
| Barry
  Bonds | 279 | 0.460 | 0.165 | 
| Babe Ruth | 235 | 0.298 | 0.127 | 
| Hank
  Aaron | 234 | 0.301 | 0.128 | 
| Ted
  Williams | 221 | 0.299 | 0.136 | 
| Willie
  Stargell | 202 | 0.251 | 0.124 | 
| Cy
  Williams | 190 | 0.219 | 0.115 | 
| Norm Cash | 181 | 0.212 | 0.118 | 
| Frank
  Robinson | 180 | 0.214 | 0.119 | 
| Willie
  McCovey | 170 | 0.211 | 0.124 | 
| Bob
  Johnson | 169 | 0.163 | 0.096 | 
 
 
The story for HR% is similar. Bonds is not number 1 here, but he ranks very high. The average ratio here is .84, meaning the average player lost 16% of their relative HR%.
 
 
 
| PLAYER | Rate <36 | HR% | LEAGUE | Rate 36-39 | HR% | LEAGUE | Ratio | 
| Dummy Hoy | 58 | 0.49 | 0.85 | 131 | 0.75 | 0.57 | 2.26 | 
| Maury
  Wills | 9 | 0.23 | 2.48 | 16 | 0.37 | 2.40 | 1.78 | 
| Fred
  Tenney | 49 | 0.26 | 0.52 | 87 | 0.45 | 0.52 | 1.78 | 
| Ken
  Griffey Sr. | 79 | 1.77 | 2.26 | 135 | 3.44 | 2.55 | 1.71 | 
| Hank
  Aaron | 222 | 5.87 | 2.65 | 355 | 8.59 | 2.42 | 1.60 | 
| Mark
  McLemore | 24 | 0.76 | 3.10 | 38 | 1.23 | 3.22 | 1.58 | 
| Barry
  Bonds | 245 | 6.63 | 2.71 | 384 | 12.73 | 3.31 | 1.57 | 
| Bill
  Bruton | 47 | 1.39 | 2.94 | 72 | 2.10 | 2.93 | 1.53 | 
| Tony
  Gwynn | 51 | 1.22 | 2.40 | 78 | 2.40 | 3.09 | 1.53 | 
| Doc
  Cramer | 21 | 0.39 | 1.85 | 32 | 0.38 | 1.21 | 1.52 | 
| Mickey
  Vernon | 88 | 1.62 | 1.84 | 129 | 3.10 | 2.41 | 1.47 | 
| Wally
  Schang | 117 | 0.90 | 0.77 | 166 | 2.02 | 1.22 | 1.42 | 
| Eddie Joost | 125 | 2.16 | 1.73 | 171 | 3.62 | 2.12 | 1.37 | 
| Ernie
  Lombardi | 204 | 3.04 | 1.49 | 273 | 4.13 | 1.51 | 1.34 | 
| Ron
  Fairly | 120 | 2.88 | 2.41 | 160 | 3.62 | 2.26 | 1.33 | 
| Steve
  Finley | 106 | 2.97 | 2.82 | 137 | 4.52 | 3.31 | 1.29 | 
| Billy
  Shindle | 67 | 0.54 | 0.81 | 84 | 0.50 | 0.59 | 1.25 | 
| Tony
  Phillips | 67 | 1.76 | 2.63 | 84 | 2.72 | 3.23 | 1.25 | 
| Davey
  Lopes | 99 | 2.15 | 2.16 | 124 | 2.99 | 2.42 | 1.25 | 
| Marquis
  Grissom | 89 | 2.62 | 2.93 | 111 | 3.66 | 3.29 | 1.25 | 
| Brian
  Downing | 130 | 3.19 | 2.46 | 161 | 4.26 | 2.65 | 1.24 | 
| Norm Cash | 206 | 5.60 | 2.72 | 255 | 5.70 | 2.24 | 1.24 | 
| Andres
  Galarraga | 177 | 4.51 | 2.55 | 216 | 6.85 | 3.17 | 1.22 | 
| Harry
  Hooper | 124 | 0.75 | 0.60 | 151 | 1.74 | 1.16 | 1.22 | 
| Darrell
  Evans | 186 | 3.98 | 2.14 | 224 | 5.94 | 2.65 | 1.20 | 
 
 
If we use a player’s HR% minus the league average, Bonds jumps to first and is far ahead of everyone else. Under 36, Bonds’ HR% was 3.92 percentage points better than average. From 36-39, he was 9.42 percentage points better than average, for a gain of 5.50.
 
 
 
| PLAYER | DIFF <36 | HR% | LEAGUE | DIFF 36-39 | HR% | LEAGUE | DIFF | 
| Barry
  Bonds | 3.92 | 6.63 | 2.71 | 9.42 | 12.73 | 3.31 | 5.50 | 
| Hank
  Aaron | 3.22 | 5.87 | 2.65 | 6.17 | 8.59 | 2.42 | 2.95 | 
| Andres
  Galarraga | 1.96 | 4.51 | 2.55 | 3.68 | 6.85 | 3.17 | 1.72 | 
| Darrell
  Evans | 1.84 | 3.98 | 2.14 | 3.29 | 5.94 | 2.65 | 1.45 | 
| Cy
  Williams | 2.30 | 3.13 | 0.83 | 3.73 | 5.00 | 1.27 | 1.43 | 
| Ken
  Griffey Sr. | -0.49 | 1.77 | 2.26 | 0.89 | 3.44 | 2.55 | 1.38 | 
| Rafael
  Palmeiro | 2.25 | 5.10 | 2.85 | 3.46 | 6.69 | 3.23 | 1.21 | 
| Ernie
  Lombardi | 1.55 | 3.04 | 1.49 | 2.62 | 4.13 | 1.51 | 1.07 | 
| Eddie
  Joost | 0.43 | 2.16 | 1.73 | 1.50 | 3.62 | 2.12 | 1.07 | 
| Steve
  Finley | 0.15 | 2.97 | 2.82 | 1.21 | 4.52 | 3.31 | 1.06 | 
| Mickey
  Vernon | -0.22 | 1.62 | 1.84 | 0.69 | 3.10 | 2.41 | 0.91 | 
| Edgar
  Martinez | 1.11 | 3.98 | 2.87 | 2.01 | 5.33 | 3.32 | 0.90 | 
| Ron
  Fairly | 0.47 | 2.88 | 2.41 | 1.36 | 3.62 | 2.26 | 0.89 | 
| Brian
  Downing | 0.73 | 3.19 | 2.46 | 1.61 | 4.26 | 2.65 | 0.88 | 
| Bill
  Bruton | -1.55 | 1.39 | 2.94 | -0.83 | 2.10 | 2.93 | 0.72 | 
| Willie
  Stargell | 3.67 | 5.97 | 2.30 | 4.39 | 6.51 | 2.12 | 0.72 | 
| Marquis
  Grissom | -0.31 | 2.62 | 2.93 | 0.37 | 3.66 | 3.29 | 0.68 | 
| Wally
  Schang | 0.13 | 0.90 | 0.77 | 0.80 | 2.02 | 1.22 | 0.67 | 
| Joe
  Adcock | 2.16 | 5.00 | 2.84 | 2.82 | 5.60 | 2.78 | 0.66 | 
| Doc
  Cramer | -1.46 | 0.39 | 1.85 | -0.83 | 0.38 | 1.21 | 0.63 | 
| Norm Cash | 2.88 | 5.60 | 2.72 | 3.46 | 5.70 | 2.24 | 0.58 | 
| Davey
  Lopes | -0.01 | 2.15 | 2.16 | 0.57 | 2.99 | 2.42 | 0.58 | 
| Ellis
  Burks | 1.88 | 4.72 | 2.84 | 2.44 | 5.64 | 3.20 | 0.56 | 
| Gary
  Gaetti | 1.19 | 3.84 | 2.65 | 1.74 | 4.77 | 3.03 | 0.55 | 
| Carlton
  Fisk | 1.76 | 4.05 | 2.29 | 2.30 | 5.24 | 2.94 | 0.54 | 
 
 
Below are the top 10 HR%s relative to the league average for ages 36-39, regardless of improvement.
 
| PLAYER | RATE | HR% | LEAGUE | 
| Babe Ruth | 500 | 7.88 | 1.57 | 
| Cy
  Williams | 395 | 5.00 | 1.27 | 
| Barry
  Bonds | 384 | 12.73 | 3.31 | 
| Hank
  Aaron | 355 | 8.59 | 2.42 | 
| Willie
  Stargell | 307 | 6.51 | 2.12 | 
| Ted
  Williams | 286 | 7.48 | 2.61 | 
| Ken
  Williams | 283 | 3.29 | 1.16 | 
| Ernie
  Lombardi | 273 | 4.13 | 1.51 | 
| Norm Cash | 255 | 5.70 | 2.24 | 
| Willie
  McCovey | 253 | 5.48 | 2.16 | 
 
 
Finally, we come to offensive winning percentage (OWP). Here are the top 25 in terms of the older OWP relative to the younger OWP.
 
| Player | OWP <36 | OWP 36-39 | Ratio | 
| Mark
  McLemore | 0.381 | 0.522 | 1.37 | 
| Luke
  Appling | 0.557 | 0.686 | 1.23 | 
| Andres
  Galarraga | 0.537 | 0.653 | 1.22 | 
| Barry
  Bonds | 0.763 | 0.924 | 1.21 | 
| Tony
  Fernandez | 0.491 | 0.593 | 1.21 | 
| Cy
  Williams | 0.546 | 0.648 | 1.19 | 
| Ozzie
  Smith | 0.454 | 0.522 | 1.15 | 
| Gary
  Gaetti | 0.440 | 0.505 | 1.15 | 
| Lave
  Cross | 0.467 | 0.525 | 1.12 | 
| Dummy Hoy | 0.554 | 0.608 | 1.10 | 
| Brian
  Downing | 0.582 | 0.636 | 1.09 | 
| Mickey
  Vernon | 0.563 | 0.615 | 1.09 | 
| Joe
  Adcock | 0.571 | 0.616 | 1.08 | 
| Lou
  Whitaker | 0.585 | 0.631 | 1.08 | 
| Eddie
  Joost | 0.501 | 0.538 | 1.07 | 
| Bob
  Johnson | 0.642 | 0.689 | 1.07 | 
| Gene
  Woodling | 0.614 | 0.657 | 1.07 | 
| Doc
  Cramer | 0.417 | 0.446 | 1.07 | 
| Darrell
  Evans | 0.589 | 0.629 | 1.07 | 
| Joe Kuhel | 0.523 | 0.558 | 1.07 | 
| Hal McRae | 0.591 | 0.629 | 1.06 | 
| Gabby
  Hartnett | 0.605 | 0.641 | 1.06 | 
| Zack
  Wheat | 0.639 | 0.677 | 1.06 | 
| Kid
  Gleason | 0.375 | 0.396 | 1.06 | 
| Tim
  Wallach | 0.479 | 0.504 | 1.05 | 
 
If we go with the difference between the older age and the younger age, Bonds jumps to first place.
 
| Player | OWP <36 | OWP 36-39 | DIFF | 
| Barry
  Bonds | 0.763 | 0.924 | 0.161 | 
| Mark
  McLemore | 0.381 | 0.522 | 0.141 | 
| Luke
  Appling | 0.557 | 0.686 | 0.129 | 
| Andres
  Galarraga | 0.537 | 0.653 | 0.116 | 
| Tony
  Fernandez | 0.491 | 0.593 | 0.102 | 
| Cy
  Williams | 0.546 | 0.648 | 0.102 | 
| Ozzie
  Smith | 0.454 | 0.522 | 0.068 | 
| Gary
  Gaetti | 0.440 | 0.505 | 0.065 | 
| Lave
  Cross | 0.467 | 0.525 | 0.058 | 
| Brian
  Downing | 0.582 | 0.636 | 0.054 | 
| Dummy Hoy | 0.554 | 0.608 | 0.054 | 
| Mickey
  Vernon | 0.563 | 0.615 | 0.052 | 
| Bob
  Johnson | 0.642 | 0.689 | 0.047 | 
| Lou
  Whitaker | 0.585 | 0.631 | 0.046 | 
| Joe
  Adcock | 0.571 | 0.616 | 0.045 | 
| Gene
  Woodling | 0.614 | 0.657 | 0.043 | 
| Darrell
  Evans | 0.589 | 0.629 | 0.040 | 
| Hal McRae | 0.591 | 0.629 | 0.038 | 
| Zack
  Wheat | 0.639 | 0.677 | 0.038 | 
| Eddie
  Joost | 0.501 | 0.538 | 0.037 | 
| Gabby
  Hartnett | 0.605 | 0.641 | 0.036 | 
| Joe Kuhel | 0.523 | 0.558 | 0.035 | 
| Harold
  Baines | 0.582 | 0.612 | 0.030 | 
| Doc
  Cramer | 0.417 | 0.446 | 0.029 | 
| Tim
  Wallach | 0.479 | 0.504 | 0.025 | 
 
 
Below are the top OWPs for ages 36-39, regardless of improvement.
 
| Player | OWP | 
| Barry
  Bonds | 0.924 | 
| Ted
  Williams | 0.834 | 
| Babe Ruth | 0.832 | 
| Edgar
  Martinez | 0.743 | 
| Hank
  Aaron | 0.736 | 
| Bob
  Johnson | 0.689 | 
| Ty Cobb | 0.689 | 
| Honus
  Wagner | 0.688 | 
| Luke
  Appling | 0.686 | 
| Cap Anson | 0.686 | 
 
Below are the top 15 OWPs of all time, regardless of age. Before 2001, no player had reached .924, Bonds’ OWP for the whole period that covers ages 36-39. Notice how unusual it is for someone aged 36-39 to have such a great OWP. It appears that no one has aged as well as Bonds.
 
 
| Rank | Player | YEAR | OWP | AGE | 
| 1 | Barry
  Bonds | 2002 | 0.942 | 37 | 
| 2 | Barry
  Bonds | 2004 | 0.929 | 39 | 
| 3 | Barry
  Bonds | 2001 | 0.922 | 36 | 
| 4 | Mickey
  Mantle | 1957 | 0.915 | 25 | 
| 5 | Babe Ruth | 1920 | 0.913 | 25 | 
| 6 | Fred
  Dunlap | 1884 | 0.909 | 25 | 
| 7 | Ted
  Williams | 1941 | 0.908 | 22 | 
| 8 | Barry
  Bonds | 2003 | 0.897 | 38 | 
| 9 | Babe Ruth | 1923 | 0.896 | 28 | 
| 10 | Babe Ruth | 1921 | 0.891 | 26 | 
| 11 | Ted
  Williams | 1957 | 0.891 | 38 | 
| 12 | Babe Ruth | 1926 | 0.883 | 31 | 
| 13 | Ted
  Williams | 1942 | 0.881 | 23 | 
| 14 | Pete
  Browning | 1882 | 0.88 | 21 | 
| 15 | Babe Ruth | 1924 | 0.879 | 29 |