For single seasons, From 1901 to 2007, From Age 30 to 99, During first season , (requiring HR>=15), sorted by greatest HR

Player ages are computed as their age on June 30th

  Cnt Player            **HR** Year Age Tm  Lg  G   PA  AB  R   H  2B 3B RBI  BB IBB  SO HBP  SH  SF GDP  SB CS   BA   OBP   SLG   OPS  Positions
 ----+-----------------+------+----+---+---+--+---+---+---+---+---+--+--+---+---+---+---+---+---+---+---+---+--+-----+-----+-----+-----+--------- 
    1 Kenji Johjima       18   2006  30 SEA AL 144 542 506  61 147 25  1  76  20   1  46  13   0   3  15   3  1  .291  .332  .451  .783 *2        
    2 Sam Jethroe         18   1950  32 BSN NL 141 642 582 100 159 28  8  58  52   0  93   5   3   0   8  35  0  .273  .338  .442  .780 *8        
    3 Buzz Arlett         18   1931  32 PHI NL 121 469 418  65 131 26  7  72  45   0  39   5   1   0   0   3  0  .313  .387  .538  .925 *93       
    4 Jim Baxes           17   1959  30 TOT ML  88 308 280  39  69 12  0  39  25   0  54   1   2   0  15   1  1  .246  .310  .471  .781 5         
    5 George Watkins      17   1930  30 STL NL 119 424 391  85 146 32  7  87  24   0  49   4   5   0   0   5  0  .373  .415  .621 1.036 *93/784   
    6 Tadahito Iguchi     15   2005  30 CHW AL 135 581 511  74 142 25  6  71  47   0 114   6  11   6  16  15  5  .278  .342  .438  .780 *4        

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