BigDude's Notes:

NOTE on creating Positional Leaderboards

Player ages are computed as their age on June 30th

  Cnt                       Year Age
 ----+-----------------+---+----+--- 
    1 Jocko Conlan          1934  34 
    2 Willard Brown         1947  32 
    3 Monte Irvin           1949  30 
    4 Jackie Robinson       1947  28 
    5 Earl Averill          1929  27 
    6 Roy Campanella        1948  26 
    7 Miller Huggins        1904  26 
    8 Sparky Anderson       1959  25 
    9 Earle Combs           1924  25 
   10 Walter Alston         1936  24 
   11 Dave Bancroft         1915  24 
   12 Wade Boggs            1982  24 
   13 Kirby Puckett         1984  24 
   14 Bill Terry            1923  24 
   15 Luke Appling          1930  23 
   16 Larry Doby            1947  23 
   17 Rick Ferrell          1929  23 
   18 Ralph Kiner           1946  23 
   19 Chuck Klein           1928  23 
   20 Ernie Lombardi        1931  23 
   21 Johnny Mize           1936  23 
   22 Branch Rickey         1905  23 
   23 Phil Rizzuto          1941  23 
   24 Ozzie Smith           1978  23 
   25 Paul Waner            1926  23 
 ----+-----------------+---+----+--- 
  Cnt                       Year Age
 ----+-----------------+---+----+--- 
   26 Hack Wilson           1923  23 
   27 Luis Aparicio         1956  22 
   28 Frank Baker           1908  22 
   29 Ernie Banks           1953  22 
   30 Jim Bottomley         1922  22 
   31 Lou Brock             1961  22 
   32 Mickey Cochrane       1925  22 
   33 Kiki Cuyler           1921  22 
   34 Tony Gwynn            1982  22 
   35 Bucky Harris          1919  22 
   36 Tony Lazzeri          1926  22 
   37 Tony Perez            1964  22 
   38 Mike Schmidt          1972  22 
   39 Red Schoendienst      1945  22 
   40 Al Simmons            1924  22 
   41 George Sisler         1915  22 
   42 Enos Slaughter        1938  22 
   43 Willie Stargell       1962  22 
   44 Richie Ashburn        1948  21 
   45 Yogi Berra            1946  21 
   46 Rod Carew             1967  21 
   47 Bill Dickey           1928  21 
   48 Joe DiMaggio          1936  21 
   49 Carlton Fisk          1969  21 
   50 Charlie Gehringer     1924  21 
 ----+-----------------+---+----+--- 
  Cnt                       Year Age
 ----+-----------------+---+----+--- 
   51 Chick Hafey           1924  21 
   52 Gabby Hartnett        1922  21 
   53 Billy Herman          1931  21 
   54 Harry Hooper          1909  21 
   55 Reggie Jackson        1967  21 
   56 Heinie Manush         1923  21 
   57 Willie McCovey        1959  21 
   58 Paul Molitor          1978  21 
   59 Eddie Murray          1977  21 
   60 Pee Wee Reese         1940  21 
   61 Ryne Sandberg         1981  21 
   62 Joe Sewell            1920  21 
   63 Casey Stengel         1912  21 
   64 Joe Tinker            1902  21 
   65 Pie Traynor           1920  21 
   66 Lloyd Waner           1927  21 
   67 Zack Wheat            1909  21 
   68 Billy Williams        1959  21 
   69 Dave Winfield         1973  21 
   70 Carl Yastrzemski      1961  21 
   71 Hank Aaron            1954  20 
   72 Lou Boudreau          1938  20 
   73 George Brett          1973  20 
   74 Max Carey             1910  20 
   75 Gary Carter           1974  20 
 ----+-----------------+---+----+--- 
  Cnt                       Year Age
 ----+-----------------+---+----+--- 
   76 Orlando Cepeda        1958  20 
   77 Roberto Clemente      1955  20 
   78 Johnny Evers          1902  20 
   79 Frankie Frisch        1919  20 
   80 Lou Gehrig            1923  20 
   81 Goose Goslin          1921  20 
   82 George Kell           1943  20 
   83 Bob Lemon             1941  20 
   84 Rabbit Maranville     1912  20 
   85 Eddie Mathews         1952  20 
   86 Willie Mays           1951  20 
   87 Bill McKechnie        1907  20 
   88 Joe Medwick           1932  20 
   89 Stan Musial           1941  20 
   90 Cal Ripken            1981  20 
   91 Frank Robinson        1956  20 
   92 Edd Roush             1913  20 
   93 Duke Snider           1947  20 
   94 Arky Vaughan          1932  20 
   95 Ted Williams          1939  20 
   96 Ross Youngs           1917  20 
   97 Johnny Bench          1967  19 
   98 Eddie Collins         1906  19 
   99 Joe Cronin            1926  19 
  100 Bobby Doerr           1937  19 
 ----+-----------------+---+----+--- 
  Cnt                       Year Age
 ----+-----------------+---+----+--- 
  101 Leo Durocher          1925  19 
  102 Nellie Fox            1947  19 
  103 Hank Greenberg        1930  19 
  104 Harry Heilmann        1914  19 
  105 Rogers Hornsby        1915  19 
  106 George Kelly          1915  19 
  107 Al Lopez              1928  19 
  108 Mickey Mantle         1951  19 
  109 Bill Mazeroski        1956  19 
  110 Joe Morgan            1963  19 
  111 Ray Schalk            1912  19 
  112 Tris Speaker          1907  19 
  113 Ty Cobb               1905  18 
  114 Travis Jackson        1922  18 
  115 Al Kaline             1953  18 
  116 Harmon Killebrew      1954  18 
  117 Freddie Lindstrom     1924  18 
  118 Brooks Robinson       1955  18 
  119 Robin Yount           1974  18 
  120 Jimmie Foxx           1925  17 
  121 Mel Ott               1926  17 

Seasons/Careers found: 121.

 Photos from the George Grantham Bain Collection at the Library of Congress.