For single seasons, From 1901 to 2008, From Age 42 to 99, (requiring G≥60), sorted by greatest ERAp

Player ages are computed as their age on June 30th

  Cnt Player            **ERA **  G  Year Age Tm  Lg  GS CG SHO GF  W  L  W-L% SV   IP   H   R   ER  BB  SO   ERA  HR  BF   AB  2B 3B IBB HBP  SH  SF GDP  SB CS Pk BK WP   BA   OBP   SLG   OPS  OPS   Pit  Str
 ----+-----------------+--------+---+----+---+---+--+---+--+---+--+--+--+-----+--+-----+---+---+---+---+---+------+--+----+----+--+--+---+---+---+---+---+---+--+--+--+--+-----+-----+-----+-----+----+----+---- 
    1 Hoyt Wilhelm         184    72 1968  45 CHW AL   0  0   0 39  4  4  .500 12  93.2  69  20  18  24  72   1.73  4  368  337  5  0   5   2   4   2   5  12  5  1  0  1  .205  .260  .255  .515   58           
    2 Hoyt Wilhelm         176    66 1965  42 CHW AL   0  0   0 45  7  7  .500 20 144    88  34  29  32 106   1.81 11  545  502 12  3   7   2   8   5  10   9  1  1  0 10  .175  .226  .277  .503   51           
    3 Joe Heving           168    63 1944  43 CLE AL   1  0   0 38  8  3  .727 10 119.2 106  42  26  41  46   1.96  2  499                  2                        0  1                            0           
    4 Rick Honeycutt       148    61 1996  42 STL NL   0  0   0 13  2  1  .667  4  47.1  42  15  15   7  30   2.85  3  190  175  5  0   3   0   5   3   4   1  0  0  2  1  .240  .265  .320  .585   57           
    5 Diomedes Olivo       142    62 1962  43 PIT NL   1  0   0 19  5  1  .833  7  84.1  88  30  26  25  66   2.77  5  356  319 13  2   7   0   8   5   8   6  0  0  0  0  .276  .324  .376  .700   82           
    6 Doug Jones           129    70 1999  42 OAK AL   0  0   0 35  5  5  .500 10 104   106  43  41  24  63   3.55 10  430  397 19  3   3   3   3   3  14   5  1  0  0  2  .267  .311  .406  .717   86           
    7 Woodie Fryman         97    60 1982  42 MON NL   0  0   0 34  9  4  .692 12  69.2  66  36  29  26  46   3.75  3  292  255  5  2   4   1   7   3   6   2  2  1  0  2  .259  .326  .329  .655   87           
    8 Jim Kaat              89    62 1982  43 STL NL   2  0   0 12  5  3  .625  2  75    79  40  34  23  35   4.08  6  321  286 19  4   9   2   4   6   8   6  1  1  0  2  .276  .328  .434  .762  117           
    9 Jesse Orosco          88    65 1999  42 BAL AL   0  0   0 12  0  2  .000  1  32    28  21  19  20  35   5.34  5  144  117  6  1   3   2   2   3   4   4  0  0  0  2  .239  .352  .436  .788  103           
   10 Jesse Orosco          53    65 2003  46 TOT ML   0  0   0 13  2  2  .500  2  33.2  41  31  29  21  29   7.75  4  166  137  8  1   3   3   1   4   0   7  0  0  0  7  .299  .394  .460  .854  134  647  376 

Seasons/Careers found: 10.

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