Alex Rodriguez has launched the most career homers by a player younger than 29, with 369 home runs.

Interpreted as:

most homerun before turning 29 years old by a player

	NAME	HR	G	AB	R	H	2B	3B	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Alex Rodriguez A. Rodriguez	369	1,373	5,368	1,079	1,640	300	23	1,052	612	78	1,080	196	48	6,130	3,093	692	16	56	42	122	.306	.381	.576	.957
2	Ken Griffey Jr. K. Griffey Jr.	350	1,375	5,226	940	1,569	294	27	1,018	656	40	876	143	53	5,982	2,967	671	6	54	153	101	.300	.379	.568	.947
3	Jimmie Foxx J. Foxx	343	1,411	4,982	1,105	1,690	289	87	1,220	887	8	763	61		5,934	3,182	719	57				.339	.440	.639	1.079
4	Eddie Mathews E. Mathews	338	1,330	4,894	929	1,373	200	49	902	836	14	793	43	22	5,809	2,685	587	30	35	52	66	.281	.385	.549	.933
5	Mickey Mantle M. Mantle	320	1,399	5,004	1,112	1,537	225	60	935	1,003	9	1,028	111	31	6,051	2,842	605	12	23	60	55	.307	.422	.568	.990
6	Albert Pujols A. Pujols	319	1,239	4,578	947	1,531	342	13	977	696	60	506	45	26	5,382	2,856	674	1	47	154	157	.334	.425	.624	1.049
7	Andruw Jones A. Jones	309	1,468	5,338	870	1,428	277	32	917	570	63	1,143	131	52	6,023	2,696	618	6	46	53	131	.268	.343	.505	.848
8	Mel Ott M. Ott	306	1,589	5,621	1,131	1,775	313	55	1,193	920	32	469	58		6,646	3,116	674	73				.316	.415	.554	.969
9	Giancarlo Stanton G. Stanton	305	1,144	4,194	678	1,124	236	11	772	557	44	1,351	41	14	4,824	2,297	552	0	29	79	90	.268	.358	.548	.905
10	Juan Gonzalez J. Gonzalez	301	1,104	4,269	677	1,238	246	18	947	293	44	842	18	12	4,654	2,423	565	2	46	56	119	.290	.339	.568	.906
11	Hank Aaron H. Aaron	298	1,350	5,309	957	1,697	292	73	991	463	20	513	72	32	5,868	3,029	663	19	57	106	146	.320	.373	.571	.943
12	Mike Trout M. Trout	289	1,208	4,376	910	1,335	252	46	761	806	82	1,126	200	36	5,313	2,546	587	0	49	101	58	.305	.418	.582	1.000
13	Frank Robinson F. Robinson	287	1,314	4,826	920	1,467	276	45	879	611	99	680	142	49	5,598	2,694	608	13	49	106	123	.304	.390	.558	.948
14	Harmon Killebrew H. Killebrew	285	1,063	3,673	618	953	125	13	708	601	29	858	6	8	4,332	1,959	423	0	29	31	92	.259	.365	.533	.899
15	Miguel Cabrera M. Cabrera	280	1,362	5,081	859	1,607	347	13	994	650	39	1,016	29	17	5,825	2,820	640	5	50	146	168	.316	.395	.555	.950
16	Adam Dunn A. Dunn	278	1,131	3,871	699	955	201	8	672	797	58	1,256	59	19	4,749	2,006	487	2	21	81	57	.247	.381	.518	.900
17	Prince Fielder P. Fielder	268	1,191	4,223	672	1,213	240	10	796	676	97	892	17	11	5,044	2,277	518	0	48	136	104	.287	.394	.539	.933
18	Bryce Harper B. Harper	267	1,283	4,557	850	1,273	270	22	752	833	36	1,189	111	39	5,482	2,388	559	12	44	103	93	.279	.392	.524	.916
19	Ralph Kiner R. Kiner	257	905	3,249	637	931	130	29	684	660	12	450	15	1	3,924	1,890	416	3			84	.287	.409	.582	.991
20	Johnny Bench J. Bench	256	1,371	5,060	757	1,355	260	19	929	597	15	846	53	28	5,744	2,421	535	5	67	101	132	.268	.343	.478	.821
21	Darryl Strawberry D. Strawberry	252	1,109	3,903	662	1,025	187	30	733	580	26	960	191	75	4,549	2,028	469	1	39	108	45	.263	.359	.520	.878
22	Manny Ramirez M. Ramirez	251	1,016	3,658	696	1,158	248	13	860	568	39	829	28	24	4,312	2,185	512	2	45	56	102	.317	.410	.597	1.007
23	Willie Mays W. Mays	251	1,083	4,143	790	1,321	211	81	721	517	15	441	185	55	4,712	2,447	543	1	36	72	92	.319	.393	.591	.984
24	Lou Gehrig L. Gehrig	247	1,133	4,176	990	1,427	292	109	1,050	734	19	482	60		5,029	2,678	648	100				.342	.442	.641	1.084
25	Jose Canseco J. Canseco	245	1,032	3,886	644	1,033	185	9	780	449	45	1,060	134	59	4,429	1,971	439	1	48	37	95	.266	.345	.507	.852