most games played by player through 21 years old

Robin Yount has the most career games by a player 21 or younger, with 556 games.

Interpreted as:

most regular-season games played by player through 21 years old

	NAME	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Robin Yount R. Yount	556	2,095	238	560	94	14	17	175	123	4	263	51	28	2,272	733	125	34	16	7	33	.267	.307	.350	.657
2	Mel Ott M. Ott	539	1,724	359	570	106	14	86	372	285	10	127	21		2,064	962	206	45				.331	.428	.558	.986
3	Ed Kranepool E. Kranepool	507	1,688	164	417	71	12	38	169	130	7	238	6	10	1,848	626	121	5	18	18	38	.247	.301	.371	.671
4	Al Kaline A. Kaline	473	1,737	269	540	74	21	59	275	175	7	161	23	14	1,939	833	154	8	12	16	48	.311	.374	.480	.853
5	Ken Griffey Jr. K. Griffey Jr.	436	1,600	228	478	93	8	60	241	178	5	246	50	24	1,805	767	161	5	17	41	26	.299	.367	.479	.847
6	Freddie Lindstrom F. Lindstrom	435	1,539	259	458	73	30	20	171	107	7	91	29		1,704	651	123	51				.298	.346	.423	.769
7	Phil Cavarretta P. Cavarretta	429	1,532	201	422	71	23	24	212	97	8	152	22		1,656	611	118	19				.275	.322	.399	.721
8	Sibby Sisti S. Sisti	409	1,476	196	363	56	12	12	116	116	9	212	18		1,627	479	80	26			26	.246	.305	.325	.629
9	Buddy Lewis B. Lewis	407	1,739	287	520	74	26	25	214	139	7	119	29		1,907	721	125	22				.299	.353	.415	.768
10	Tony Conigliaro T. Conigliaro	399	1,483	228	405	68	14	84	227	137	15	306	6	8	1,657	753	166	12	10	15	26	.273	.339	.508	.846
11	Cesar Cedeno C. Cedeno	390	1,525	234	450	100	18	39	205	96	10	221	92	34	1,651	703	157	7	13	12	28	.295	.338	.461	.799
12	Rusty Staub R. Staub	370	1,215	112	283	47	7	28	143	132	10	146	4	1	1,375	428	82	7	11	17	35	.233	.311	.352	.663
13	Adrian Beltre A. Beltre	367	1,243	173	338	66	7	42	174	131	11	222	33	13	1,403	544	115	9	9	14	21	.272	.344	.438	.782
14	Mickey Mantle M. Mantle	365	1,351	260	398	72	15	57	244	197	0	275	20	12	1,552	671	144	4			10	.295	.384	.497	.881
15	Jimmie Foxx J. Foxx	364	1,088	241	372	61	25	49	223	179	4	131	15		1,302	630	135	31				.342	.437	.579	1.016
16	Bill Mazeroski B. Mazeroski	362	1,277	146	347	56	12	27	131	67	4	133	4	4	1,377	508	95	23	6	6	23	.272	.309	.398	.707
17	Travis Jackson T. Jackson	362	1,343	178	387	53	17	24	172	66	2	141	17		1,436	546	94	25				.288	.322	.407	.729
18	Cass Michaels C. Michaels	359	1,166	119	293	35	10	6	115	106	10	97	27		1,310	366	51	28			33	.251	.319	.314	.633
19	Bryce Harper B. Harper	357	1,309	210	356	60	14	55	149	155	8	318	31	12	1,489	609	129	9	8	8	18	.272	.351	.465	.816
20	Andruw Jones A. Jones	357	1,136	171	284	59	11	55	184	115	9	275	51	16	1,274	530	125	6	8	10	23	.250	.322	.467	.788
21	Ivan Rodriguez I. Rodriguez	348	1,173	119	312	60	5	21	130	58	5	185	8	8	1,261	445	86	14	11	5	41	.266	.301	.379	.680
22	Bob Kennedy B. Kennedy	333	1,240	123	295	48	11	4	119	75	0	120	19		1,339	377	63	24			31	.238	.281	.304	.585
23	Richard Hoblitzell R. Hoblitzell	329	1,244	152	358	50	26	8		96	6		48		1,395	484	84	49				.288	.342	.389	.731
24	Johnny Bench J. Bench	328	1,182	157	325	66	4	42	178	85	6	201	7	12	1,292	525	112	3	16	15	26	.275	.323	.444	.767
25	Bobby Doerr B. Doerr	327	1,181	167	347	59	10	19	167	114	2	96	8		1,333	483	88	36			17	.294	.357	.409	.766