35: Home Runs and Age.

Read this post.  It covers most of the 35 home run (HR) season stuff.

Thursday, January 3, 2013
Home Run Proficiency 35 Home Runs.
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Here I'll deal with seasons in which the batter is at least 35 years old.  Age is figured simply as season year minus birth year, not using June 30 as a mid season break point as baseball-reference.com does.

I found 59 seasons of 35 HR, Age >= 35.  baseball-reference.com has 52, possibly with some of mine missing and some that I do not have.

Click this link to view my data.

Those who did it most frequently:
Hank Aaron 4 (35,36,37,39)
Barry Bonds 5 (36,37,38,39,40) 2000-2004
Andres Galarraga 3 (35,36,37) 1996-1998
Rafael Palmeiro 5 (35,36,37,38,39) 1999-2003
Babe Ruth 3 (35,36,37)
Mike Schmidt 3 (35,37,38)

Mark McGwire and Sammy Sosa did it twice each as did others.  Bonds was the oldest at 40 and three of the six who did it at least three times did it in the steroid era.

Best HR Proficiency by age:

35:

qryBattingHRratePL

First	Last	yearID	Age	X	HRp	ABp
Babe	Ruth	1930	35	5.42212404712405	49	518
Hank	Greenberg	1946	35	4.76283723748615	44	523
Tilly	Walker	1922	35	4.59804149136805	37	565
Mark	McGwire	1998	35	3.86109350331311	70	509
Johnny	Mize	1948	35	2.6997338065661	40	560
Hank	Aaron	1969	35	2.67807061852102	44	547
Mike	Schmidt	1984	35	2.58975625823452	36	528
Hank	Sauer	1952	35	2.0985971740761	37	567
Willie	Mays	1966	35	1.74079072506998	37	552
Andres	Galarraga	1996	35	1.66338331747896	47	626
Jason	Giambi	2006	35	1.58074251081756	37	446
Sammy	Sosa	2003	35	1.54927661894391	40	517
Rafael	Palmeiro	1999	35	1.49303593166555	47	565
Frank	Thomas	2003	35	1.43464512695282	42	546
Larry	Walker	2001	35	1.2985642061014	38	497
Gary	Sheffield	2003	35	1.22861636692894	39	576
Jeromy	Burnitz	2004	35	1.14853974658175	37	540
Jeff	Bagwell	2003	35	1.12108970766282	39	605
Steve	Finley	2000	35	0.928462110280292	35	539

36:

qryBattingHRratePL

First	Last	yearID	Age	X	HRp	ABp
Babe	Ruth	1931	36	6.01100982262738	46	534
Cy	Williams	1923	36	5.58124823708607	41	535
Mark	McGwire	1999	36	2.90378162439222	65	521
Barry	Bonds	2000	36	2.04809920500677	49	480
Hank	Aaron	1970	36	1.95240687071464	38	516
Reggie	Jackson	1982	36	1.78894363658214	39	530
Jim	Thome	2006	36	1.67025330899133	42	490
Dave	Kingman	1984	36	1.53570174329583	35	549
Andres	Galarraga	1997	36	1.46679469054351	41	600
Ken	Griffey	2005	36	1.45440722794185	35	491
Manny	Ramirez	2008	36	1.32836422697742	37	552
Sammy	Sosa	2004	36	1.29600091689999	35	478
Carlos	Delgado	2008	36	1.17579089832516	38	598
Rafael	Palmeiro	2000	36	1.03202277032241	39	565
Gary	Sheffield	2004	36	0.911424780762984	36	573

37:

qryBattingHRratePL

First	Last	yearID	Age	X	HRp	ABp
Babe	Ruth	1932	37	4.78880740696933	41	457
Barry	Bonds	2001	37	3.66763961576294	73	476
Hank	Aaron	1971	37	3.6625049291716	47	495
Hank	Sauer	1954	37	2.05001613018854	41	520
Mike	Schmidt	1986	37	1.93998332260518	37	552
Jim	Thome	2007	37	1.84540545281411	35	432
Andres	Galarraga	1998	37	1.77194449507024	44	555
Rafael	Palmeiro	2001	37	1.46990511047851	47	600
Gary	Gaetti	1995	37	1.20713401918659	35	514
Edgar	Martinez	2000	37	0.957770109826888	37	556
Vinny	Castilla	2004	37	0.880241980018464	35	583

38:

qryBattingHRratePL

First	Last	yearID	Age	X	HRp	ABp
Barry	Bonds	2002	38	2.91335871508994	46	403
Darrell	Evans	1985	38	1.84348285155924	40	505
Frank	Thomas	2006	38	1.60490283857559	39	466
Rafael	Palmeiro	2002	38	1.51266467251597	43	546
Mike	Schmidt	1987	38	1.46438966095488	35	522
Carlton	Fisk	1985	38	1.44151757797212	37	543
Dave	Kingman	1986	38	1.12522380449862	35	561
Moises	Alou	2004	38	1.03485759098806	39	601

39:

qryBattingHRratePL

First	Last	yearID	Age	X	HRp	ABp
Hank	Aaron	1973	39	3.43945127719962	40	392
Barry	Bonds	2003	39	2.81449493052948	45	390
Ted	Williams	1957	39	2.81422293055153	38	420
Rafael	Palmeiro	2003	39	1.13997903841822	38	561
Steve	Finley	2004	39	0.795103928190947	36	628

40:

qryBattingHRratePL

First	Last	yearID	Age	X	HRp	ABp
Barry	Bonds	2004	40	2.80102184876523	45	373