most homeruns for a player in their age 23 season since 1950

Since 1950, Mark McGwire has hit the most home runs by a 23-year-old player, with 49 homers.

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Regular season

	NAME	HR	Age	G	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Mark McGwire M. McGwire	49	23	149	546	95	159	27	4	117	70	5	130	1	1	629	341	80	0	8	7	6	.291	.372	.625	.997
2	Juan Gonzalez J. Gonzalez	46	23	140	536	105	166	33	1	118	37	13	99	4	1	587	339	80	0	1	7	12	.310	.368	.632	1.000
3	Ken Griffey Jr. K. Griffey Jr.	45	23	156	582	113	180	38	3	109	96	6	91	17	9	691	359	86	0	7	25	14	.309	.408	.617	1.025
4	Prince Fielder P. Fielder	44	24	158	561	103	157	35	2	110	94	15	114	2	0	678	328	81	0	8	21	11	.280	.392	.585	.977
5	Hank Aaron H. Aaron	44	23	151	615	118	198	27	6	132	57	0	58	1	1	675	369	77	0	3	15	14	.322	.378	.600	.978
6	Mike Trout M. Trout	43	23	152	564	113	162	25	6	98	73	13	166	14	6	655	328	74	0	5	16	10	.287	.379	.582	.960
7	Albert Pujols A. Pujols	43	23	157	591	137	212	51	1	124	79	10	65	5	1	685	394	95	0	5	12	13	.359	.439	.667	1.106
8	Troy Glaus T. Glaus	43	23	163	571	105	149	29	1	100	105	3	164	11	8	681	309	73	0	2	5	9	.261	.377	.541	.919
9	Joey Gallo J. Gallo	41	23	145	449	85	94	18	3	80	75	8	196	7	2	532	241	62	0	0	1	3	.209	.333	.537	.869
10	Reggie Jackson R. Jackson	41	24	155	564	106	148	38	3	113	108	14	146	16	6	690	315	82	2	2	20	10	.262	.392	.559	.951
11	Eddie Mathews E. Mathews	41	23	141	499	108	144	23	5	101	109	1	98	3	4	616	300	69	1	6	20	5	.289	.413	.601	1.014
12	Willie Mays W. Mays	41	24	150	559	128	196	33	13	111	73	3	59	9	5	641	378	87	0	6	1	13	.351	.424	.676	1.101
13	Orlando Cepeda O. Cepeda	40	23	152	582	96	173	28	4	131	39	10	94	12	11	634	329	72	0	3	11	20	.297	.350	.565	.915
14	Cody Bellinger C. Bellinger	38	23	159	546	98	173	26	5	104	84	4	118	17	6	638	323	69	0	4	20	6	.317	.409	.592	1.001
15	Vladimir Guerrero V. Guerrero	38	23	159	623	108	202	37	7	109	42	7	95	11	9	677	367	82	0	5	13	15	.324	.371	.589	.960
16	Manny Machado M. Machado	37	23	159	639	109	191	41	0	93	68	6	116	7	9	715	343	78	0	2	9	12	.299	.371	.537	.907
17	Jose Canseco J. Canseco	37	23	162	638	110	173	34	2	125	73	5	143	29	9	724	322	73	1	7	4	14	.271	.347	.505	.852
18	Frank Robinson F. Robinson	37	23	154	578	110	176	35	5	134	73	8	100	17	5	667	332	77	0	8	9	17	.304	.385	.574	.960
19	Mickey Mantle M. Mantle	37	23	147	517	121	158	25	11	99	113	3	98	8	2	638	316	73	2	3	6	4	.306	.431	.611	1.042
20	Andruw Jones A. Jones	36	24	163	667	124	201	37	6	102	58	8	101	20	4	737	358	79	0	4	1	10	.301	.362	.537	.899
21	Franmil Reyes F. Reyes	35	23	142	443	62	121	13	0	65	41	0	120	0	0	488	239	48	0	4	1	14	.273	.332	.540	.871
22	Will Clark W. Clark	35	23	150	529	89	163	29	5	91	49	5	98	5	17	588	307	69	3	2	11	2	.308	.371	.580	.951
23	James Wood J. Wood	34	23	135	515	107	137	31	1	81	101	4	178	21	3	624	272	66	0	4	10	7	.266	.388	.528	.916
24	Ryan Braun R. Braun	34	23	113	451	91	146	26	6	97	29	7	112	15	5	492	286	66	0	5	1	13	.324	.370	.634	1.004
25	Billy Williams B. Williams	34	24	163	632	111	195	26	11	111	65	8	80	5	1	713	345	71	0	8	11	15	.309	.376	.546	.922

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Some of the information used here was obtained free of charge from Retrosheet.

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Since 1950, Mark McGwire has hit the most home runs by a 23-year-old player, with 49 homers.

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