Kobe Bryant has the most career games by a player younger than 25 in the playoffs, with 97 games.

most nba playoff games for player under age 25

NAME	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
Kobe Bryant	97	36.9	22.2	4.9	4.2	1.2	0.8	2.7	8.0	18.3	43.9	1.0	2.9	34.9	5.2	6.6	78.6	3,583	2,155	473	407	119	82	258	317	+314
Tony Parker	90	36.2	17.2	2.9	4.5	0.9	0.1	2.7	6.9	15.6	44.0	0.6	2.1	28.3	2.9	4.0	71.7	3,258	1,547	260	407	85	8	246	206	+230
Kawhi Leonard	75	33.1	14.7	7.2	1.5	1.7	0.7	1.3	5.6	10.9	51.2	1.3	3.2	42.0	2.2	3.0	74.4	2,479	1,100	543	114	127	49	96	168	+367
Jayson Tatum	74	38.3	22.9	6.8	4.4	1.1	0.9	3.0	7.6	17.4	43.8	2.3	6.2	37.2	5.3	6.5	82.0	2,836	1,693	503	325	85	66	220	199	+186
Andrew Bynum	74	24.2	9.5	6.7	0.6	0.3	1.5	1.1	3.7	7.4	50.2	0.0	0.0		2.1	2.9	72.0	1,789	706	497	48	24	110	78	199	-54
Serge Ibaka	71	30.4	10.6	6.8	0.5	0.4	2.8	0.9	4.5	8.7	51.0	0.1	0.4	37.0	1.6	2.0	77.1	2,159	755	486	37	28	198	65	232	+87
Darryl Dawkins	71	25.3	12.3	6.6	1.2				4.9	9.1	53.5	0.0	0.1	0.0	2.5	3.8	66.5	1,794	871	472	86				268
Jordan Farmar	69	15.0	5.1	1.5	1.4	0.6	0.1	0.9	1.9	4.7	39.5	0.7	2.1	35.7	0.6	0.8	78.2	1,036	350	102	100	39	8	60	82	-66
Magic Johnson	69	41.0	17.9	9.2	11.3	2.5	0.6	3.8	6.6	12.8	51.5	0.0	0.4	6.7	4.7	5.8	80.8	2,827	1,237	634	778	173	44	263	231
Harrison Barnes	64	31.9	10.7	5.1	1.3	0.7	0.4	1.0	4.1	9.7	41.9	1.2	3.3	35.5	1.4	1.9	75.6	2,040	687	327	85	42	23	61	137	+174
Rajon Rondo	64	37.2	13.8	5.9	8.3	2.0	0.2	2.5	5.5	12.7	43.2	0.3	1.1	29.4	2.5	3.9	63.9	2,382	881	377	532	126	14	157	178	+184
Grant Williams	61	18.8	5.7	2.6	0.8	0.3	0.5	0.5	1.8	4.0	46.1	1.1	2.5	43.3	1.0	1.2	80.0	1,145	347	160	47	16	33	29	148	-4
Jaylen Brown	61	28.6	14.8	5.0	1.4	0.9	0.4	1.5	5.6	11.7	47.6	1.7	4.8	35.9	2.0	2.6	74.5	1,743	904	302	88	52	23	93	162	+2
Clint Capela	61	21.4	8.3	7.7	0.9	0.5	1.4	0.7	3.5	5.7	60.6	0.0	0.0	0.0	1.3	2.7	50.3	1,307	504	468	57	31	87	45	116	-45
Cory Joseph	61	12.4	4.7	1.3	1.3	0.4	0.1	0.6	1.9	4.0	47.8	0.2	0.6	26.3	0.7	1.0	69.8	754	288	82	80	27	5	37	71	-34
LeBron James	60	43.8	29.4	8.3	7.3	1.6	0.8	3.7	9.7	21.6	45.2	1.5	4.8	30.1	8.4	11.3	74.4	2,629	1,761	496	436	98	48	223	147	+210
Robert Horry	57	35.0	11.9	6.3	3.4	1.5	1.1	1.4	4.2	9.4	44.4	1.5	4.0	38.0	2.1	2.7	75.0	1,993	680	358	196	85	62	80	167
James Harden	55	32.6	16.6	5.0	3.7	1.5	0.4	2.2	4.8	11.5	42.1	1.7	4.9	34.3	5.2	6.2	84.5	1,793	912	276	202	82	23	121	168	+226
Glen Davis	55	20.5	7.9	3.9	0.8	0.8	0.4	0.9	2.9	6.1	47.7	0.0	0.1	0.0	2.1	3.0	70.5	1,129	435	213	42	42	21	52	140	+25
Richard Jefferson	55	31.9	12.7	5.6	2.2	0.8	0.4	2.2	4.5	10.1	45.0	0.2	0.9	22.9	3.5	5.2	67.6	1,752	701	310	123	44	21	123	156	+106
B.J. Armstrong	55	16.8	5.8	1.3	2.2	0.8	0.0	0.8	2.2	4.9	43.9	0.1	0.5	30.8	1.3	1.6	82.8	924	318	71	119	43	1	43	68
Paul George	54	38.2	17.2	7.1	3.7	1.7	0.6	2.8	5.6	13.3	42.2	1.9	5.3	34.8	4.1	5.4	76.4	2,065	931	384	200	91	30	152	171	+98
Kevin Durant	54	42.1	28.6	8.0	3.8	1.1	1.2	3.1	9.4	20.3	46.3	2.0	6.0	34.0	7.8	9.2	84.8	2,275	1,546	432	205	62	63	170	146	+135
Jack Sikma	54	35.0	13.5	9.3	2.3				5.2	11.7	44.5	0.0	0.1	0.0	3.1	3.8	80.1	1,890	729	503	125				226
Dwight Howard	51	39.0	19.0	14.2	1.5	0.8	2.9	3.3	6.7	11.3	59.6	0.0	0.0	0.0	5.6	9.8	57.2	1,989	971	725	78	41	147	167	212	+74