30 homers, age 22 or younger

This is a complimentary post to:

30 homers, age 37 and older Tuesday, September 1, 2015

It's been done 39 times, including multiple times by some players... Age is determined before July 1...

Hank Aaron has the top: 47 at age 37 in 1971.  Aaron also has the biggest gap between homers and age: 10.  Also the biggest percentage difference: 27%.
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30 homers in a season for players 22 or younger has been done 37 times, including Bryce Harper this season.

Aaron's long time teammate on the Braves, Eddie Mathews, leads the young sluggers by matching Aaron at 47, career highs for each.  Mathews was only 21 years old, so also like Aaron he has the biggest gap between homers and age and biggest percent difference: 26 and 124%.

40 homers were hit seven times by the young sluggers.  Mathews was the only one who did it twice.  These players had career highs: DiMaggio, Bench, Ott; Bench hit exactly 40 at age 24 but neither DiMaggio nor Ott ever hit 40 again.  Ott is the youngest player ever to hit at least 40: age 20.

Young sluggers also on the old guys list: Frank Robinson and Ted Williams.

Two seasons by young sluggers: Pujols, Rodriguez, Horner, Mathews, Robinson, Stanton, Foxx, Canseco, Cabrera, Trout, Williams.

Two went on to hit at least 50 homers in a season:
Foxx: 58,50
Rodriguez: 57,54,52.

Led their league when 22 or younger in a 30 homer season:
HR: Mathews, DiMaggio, Bench, Gonzalez, Williams, Conigliaro.  Harper currently leading.
RBI: Bench, Williams, Trout (more than 150 but did not lead: DiMaggio, Foxx, Ott)
BB: Williams, Ott
HBP: Robinson
BA: Williams, Rodriguez, Pujols
OBP: Williams, Ott (Harper leading)
SLG: Williams, DiMaggio, Stanton, Powell (Harper leading)
OPS: Williams (Harper leading)

Six did it at age 20 with Conigliaro the only 20 year old leading the league: 32 in 1965.

Conspicuous by their absence:
Willie Mays: 41 in 1954, age 23; Mays missed all but 34 games in 1952 and all of 1953 in the Army.
Mickey Mantle: 37 in 1955, age 23

Both Mays and Mantle hit 50 homers for the first of two times at age 24:
Mays: 51 in 1955
Mantle 52 in 1956

Rk	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	Pos
1	Eddie Mathews	47	1953	21	MLN	NL	157	681	579	110	175	31	8	135	99		83	2	1		6	1	3	.302	.406	.627	1.033	*5
2	Joe DiMaggio	46	1937	22	NYY	AL	151	692	621	151	215	35	15	167	64		37	5	2			3	0	.346	.412	.673	1.085	*8/H
3	Johnny Bench	45	1970	22	CIN	NL	158	671	605	97	177	35	4	148	54	9	102	0	1	11	12	5	2	.293	.345	.587	.932	*273/9H85
4	Juan Gonzalez	43	1992	22	TEX	AL	155	632	584	77	152	24	2	109	35	1	143	5	0	8	16	0	1	.260	.304	.529	.833	*87/HD9
5	Alex Rodriguez	42	1998	22	SEA	AL	161	748	686	123	213	35	5	124	45	0	121	10	3	4	12	46	13	.310	.360	.560	.919	*6/D
6	Mel Ott	42	1929	20	NYG	NL	150	675	545	138	179	37	2	151	113		38	6	10			6		.328	.449	.635	1.084	*9/84
7	Eddie Mathews	40	1954	22	MLN	NL	138	600	476	96	138	21	4	103	113		61	2	3	7	9	10	3	.290	.423	.603	1.026	*57/H
8	Boog Powell	39	1964	22	BAL	AL	134	506	424	74	123	17	0	99	76	6	91	2	2	2	9	0	0	.290	.399	.606	1.005	*7H/3
9	Frank Robinson	38	1956	20	CIN	NL	152	667	572	122	166	27	6	83	64	7	95	20	8	4	14	8	4	.290	.379	.558	.936	*7/8H
10	Giancarlo Stanton	37	2012	22	MIA	NL	123	501	449	75	130	30	1	86	46	9	143	5	0	1	5	6	2	.290	.361	.608	.969	*9/HD
11	Albert Pujols	37	2001	21	STL	NL	161	676	590	112	194	47	4	130	69	6	93	9	1	7	21	1	3	.329	.403	.610	1.013	5379/HD
12	Ted Williams	37	1941	22	BOS	AL	143	606	456	135	185	33	3	120	147		27	3	0		10	2	4	.406	.553	.735	1.287	*7H/9
13	Jimmie Foxx	37	1930	22	PHA	AL	153	674	562	127	188	33	13	156	93		66	0	18			7	7	.335	.429	.637	1.066	*3
14	Mike Trout	36	2014	22	LAA	AL	157	705	602	115	173	39	9	111	83	6	184	10	0	10	6	16	2	.287	.377	.561	.939	*8/D
15	Alex Rodriguez	36	1996	20	SEA	AL	146	677	601	141	215	54	1	123	59	1	104	4	6	7	15	15	4	.358	.414	.631	1.045	*6/H
16	Bob Horner	35	1980	22	ATL	NL	124	495	463	81	124	14	1	89	27	3	50	1	0	4	16	3	1	.268	.307	.529	.836	*5/H3
17	Hal Trosky	35	1934	21	CLE	AL	154	685	625	117	206	45	9	142	58		49	2	0			2	2	.330	.388	.598	.987	*3
18	Giancarlo Stanton	34	2011	21	FLA	NL	150	601	516	79	135	30	5	87	70	6	166	9	0	6	11	5	5	.262	.356	.537	.893	*9/H8D
19	Albert Pujols	34	2002	22	STL	NL	157	675	590	118	185	40	2	127	72	13	69	9	0	4	20	2	4	.314	.394	.561	.955	*753/DH69
20	Miguel Cabrera	33	2005	22	FLA	NL	158	685	613	106	198	43	2	116	64	12	125	2	0	6	20	1	0	.323	.385	.561	.947	*75/H
21	Miguel Cabrera	33	2004	21	FLA	NL	160	685	603	101	177	31	1	112	68	5	148	6	0	8	20	5	2	.294	.366	.512	.879	*97/HD
22	Jose Canseco	33	1986	21	OAK	AL	157	682	600	85	144	29	1	117	65	1	175	8	0	9	12	15	7	.240	.318	.457	.775	*79/HD
23	Bob Horner	33	1979	21	ATL	NL	121	515	487	66	153	15	1	98	22	6	74	3	0	3	9	0	2	.314	.346	.552	.898	*53/H
24	Earl Williams	33	1971	22	ATL	NL	145	550	497	64	129	14	1	87	42	5	80	7	0	4	11	0	1	.260	.324	.491	.815	253H
25	Jimmie Foxx	33	1929	21	PHA	AL	149	638	517	123	183	23	9	118	103		70	2	16			9	7	.354	.463	.625	1.088	*3/5
Rk	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	Pos
26	Tony Conigliaro	32	1965	20	BOS	AL	138	585	521	82	140	21	5	82	51	6	116	5	6	3	9	4	2	.269	.338	.512	.850	*9/8H
27	Bryce Harper	31	2015	22	WSN	NL	123	526	422	92	139	30	1	77	98	12	107	4	0	2	10	6	4	.329	.458	.626	1.084	*9/8D
28	Andruw Jones	31	1998	21	ATL	NL	159	631	582	89	158	33	8	90	40	8	129	4	1	4	10	27	4	.271	.321	.515	.836	*8/H
29	Jose Canseco	31	1987	22	OAK	AL	159	691	630	81	162	35	3	113	50	2	157	2	0	9	16	15	3	.257	.310	.470	.780	*7D/H
30	Jason Thompson	31	1977	22	DET	AL	158	668	585	87	158	24	5	105	73	2	91	1	0	9	15	0	1	.270	.347	.487	.834	*3
31	Jim Ray Hart	31	1964	22	SFG	NL	153	625	566	71	162	15	6	81	47	4	94	4	2	6	13	5	2	.286	.342	.498	.840	*5/9H7
32	Frank Robinson	31	1958	22	CIN	NL	148	623	554	90	149	25	6	83	62	5	80	7	0	0	13	10	1	.269	.350	.504	.854	*785/H
33	Ted Williams	31	1939	20	BOS	AL	149	675	565	131	185	44	11	145	107		64	2	3		10	2	1	.327	.436	.609	1.045	*9
34	Mike Trout	30	2012	20	LAA	AL	139	639	559	129	182	27	8	83	67	4	139	6	0	7	7	49	5	.326	.399	.564	.963	*87/9H
35	Ruben Sierra	30	1987	21	TEX	AL	158	696	643	97	169	35	4	109	39	4	114	2	0	12	18	16	11	.263	.302	.470	.771	*9/8H
36	Pete Incaviglia	30	1986	22	TEX	AL	153	606	540	82	135	21	2	88	55	2	185	4	0	7	9	3	2	.250	.320	.463	.783	*9D/H7
37	Jeff Burroughs	30	1973	22	TEX	AL	151	605	526	71	147	17	1	85	67	3	88	1	0	11	8	0	0	.279	.355	.487	.842	*97/H3D

Provided by Baseball-Reference.com: View Play Index Tool Used
Generated 9/1/2015.