Eddie Mathews has launched the most homers by a 21-year-old player in a season, with 47 homers in 1953.

Interpreted as:

most home runs by a player by age 21 season

	NAME	HR	AGE	SEASON	TM	G	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Eddie Mathews E. Mathews	47	21	1953	MIL	157	579	110	175	31	8	135	99	2	83	1	3	681	363	86	1			6	.302	.406	.627	1.033	144	62.6	.451	168	60.8
2	Junior Caminero J. Caminero	45	21	2025	TBR	154	602	93	159	28	0	110	41	3	125	7	1	653	322	73	0	7	1	31	.264	.311	.535	.846	100	23	.357	134	26.3
3	Ronald Acuña Jr. R. Acuña Jr.	41	21	2019	ATL	156	626	127	175	22	2	101	76	9	188	37	9	712	324	65	0	1	4	8	.280	.365	.518	.883	120	30.1	.369	126	24
4	Cody Bellinger C. Bellinger	39	21	2017	LAD	132	480	87	128	26	4	97	64	1	146	10	3	548	279	69	0	3	13	5	.267	.352	.581	.933	94	27.3	.380	137	26.3
5	Albert Pujols A. Pujols	37	21	2001	STL	161	590	112	194	47	4	130	69	9	93	1	3	676	360	88	1	7	6	21	.329	.403	.610	1.013	139	54.7	.423	159	51.9
6	Hal Trosky Sr. H. Trosky Sr.	35	21	1934	CLE	154	625	117	206	45	9	142	58	2	49	2	2	685	374	89	0				.330	.388	.598	.987	139	52.9	.437	143	41.2
7	Giancarlo Stanton G. Stanton	34	21	2011	FLA	150	516	79	135	30	5	87	70	9	166	5	5	601	277	69	0	6	6	11	.262	.356	.537	.893	98	31	.381	141	28.4
8	Miguel Cabrera M. Cabrera	33	21	2004	FLA	160	603	101	177	31	1	112	68	6	148	5	2	685	309	65	0	8	5	20	.294	.366	.512	.879	110	25.4	.374	129	25.4
9	Jose Canseco J. Canseco	33	21	1986	OAK	157	600	85	144	29	1	117	65	8	175	15	7	682	274	63	0	9	1	12	.240	.318	.457	.775	90	10.9	.341	114	11.7
10	Bob Horner B. Horner	33	21	1979	ATL	121	487	66	153	15	1	98	22	3	74	0	2	515	269	49	0	3	6	9	.314	.346	.552	.898	86	26.4	.389	134	20.9
11	Jimmie Foxx J. Foxx	33	21	1929	PHA	149	517	123	183	23	9	118	103	2	70	9	7	638	323	65	16				.354	.463	.625	1.088	153	68.6	.480	176	66.1
12	Andruw Jones A. Jones	31	21	1998	ATL	159	582	89	158	33	8	90	40	4	129	27	4	631	300	72	1	4	8	10	.271	.321	.515	.836	89	11.2	.353	113	10.3
13	Ruben Sierra R. Sierra	30	21	1987	TEX	158	643	97	169	35	4	109	39	2	114	16	11	696	302	69	0	12	4	18	.263	.302	.470	.771	86	0.8	.327	95	-4
14	Frank Robinson F. Robinson	29	21	1957	CIN	150	611	97	197	29	5	75	44	12	92	10	2	677	323	63	5	5	5	13	.322	.376	.529	.905	116	40.7	.396	137	30.4
15	Joe DiMaggio J. DiMaggio	29	21	1936	NYY	138	637	132	206	44	15	125	24	4	39	4	0	668	367	88	3				.323	.352	.576	.928	121	33.1	.409	122	22.2
16	Julio Rodríguez J. Rodríguez	28	21	2022	SEA	132	511	84	145	25	3	75	40	8	145	25	7	560	260	56	0	1	4	7	.284	.345	.509	.853	89	25.1	.366	145	28.7
17	Cal Ripken Jr. C. Ripken Jr.	28	21	1982	BAL	160	598	90	158	32	5	93	46	3	95	3	3	655	284	65	2	6	3	16	.264	.317	.475	.792	88	14.7	.347	116	12.2
18	Tony Conigliaro T. Conigliaro	28	21	1966	BOS	150	558	77	148	26	7	93	52	5	112	0	2	628	272	61	6	7	8	6	.265	.330	.487	.817	90	23.6	.353	123	15.8
19	Mike Trout M. Trout	27	21	2013	LAA	157	589	109	190	39	9	97	110	9	136	33	7	716	328	75	0	8	10	8	.323	.432	.557	.988	140	61.1	.423	176	62.1
20	Juan Gonzalez J. Gonzalez	27	21	1991	TEX	142	545	78	144	34	1	102	42	5	118	4	4	595	261	62	0	3	7	10	.264	.321	.479	.800	82	15	.351	118	12.5
21	Eddie Murray E. Murray	27	21	1977	BAL	160	611	81	173	29	2	88	48	1	104	0	1	666	287	58	0	6	6	22	.283	.333	.470	.803	91	13.8	.350	123	17.9
22	Orlando Cepeda O. Cepeda	27	21	1959	SFG	151	605	92	192	35	4	105	33	5	100	23	9	647	316	66	0	4	10	10	.317	.355	.522	.878	105	30.9	.379	131	25.1
23	Al Kaline A. Kaline	27	21	1956	DET	153	617	96	194	32	10	128	70	1	55	7	1	693	327	69	1	4	4	10	.314	.383	.530	.913	121	40.7	.400	137	32.9
24	Hank Aaron H. Aaron	27	21	1955	MIL	153	602	105	189	37	9	106	49	3	61	3	1	665	325	73	7	4	5	20	.314	.366	.540	.906	114	36.5	.396	145	37.1
25	Justin Upton J. Upton	26	21	2009	ARI	138	526	84	158	30	7	86	55	2	137	20	5	588	280	63	1	4	3	10	.300	.366	.532	.899	98	27.2	.385	130	21.8