LeBron James has posted the most career points by a player younger than 21, with 4,649 points.

Interpreted as:

most career NBA points before turning 21 years old by a player

NAME	PTS	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	REB	AST	STL	BLK	TOV	PF	+/-
LeBron James	4,649	186	41.0	25.0	6.4	6.4	1.9	0.7	3.4	9.1	20.1	45.4	1.1	3.5	33.0	5.6	7.4	75.5	7,629	1,187	1,193	352	135	626	361	+165
Kevin Durant	3,495	154	36.7	22.7	5.4	2.6	1.1	0.8	3.0	8.1	17.9	45.3	1.0	2.8	35.9	5.5	6.3	86.7	5,653	830	397	174	128	457	256	-1152
Carmelo Anthony	3,283	157	35.7	20.9	5.9	2.7	1.1	0.5	3.0	7.4	17.2	42.8	0.7	2.4	29.8	5.5	7.0	78.7	5,603	924	421	165	71	471	454	+231
Anthony Edwards	2,925	144	33.2	20.3	4.7	3.4	1.3	0.6	2.4	7.3	17.1	42.9	2.7	7.8	34.4	3.0	3.8	78.1	4,780	679	486	187	82	350	293	-40
Devin Booker	2,897	160	31.4	18.1	3.0	3.1	0.8	0.3	2.6	6.4	15.0	42.4	1.6	4.5	35.5	3.8	4.5	83.5	5,032	473	494	122	43	419	481	-639
Luka Doncic	2,876	119	32.4	24.2	8.5	7.1	1.1	0.3	3.7	8.0	18.0	44.3	2.6	7.9	32.5	5.6	7.6	73.6	3,857	1,012	839	126	34	446	253	+142
Kobe Bryant	2,755	200	25.3	13.8	3.2	2.4	1.0	0.6	2.1	4.6	10.6	43.9	0.8	2.3	33.5	3.7	4.6	81.3	5,055	638	480	195	113	426	435	+416
Dwight Howard	2,619	184	34.9	14.2	11.5	1.3	0.8	1.6	2.4	5.1	9.5	53.5	0.0	0.0	0.0	4.0	6.4	62.9	6,415	2,109	233	152	292	449	562	-106
Andrew Wiggins	2,548	138	35.8	18.5	4.2	2.0	1.0	0.6	2.2	6.6	14.9	44.1	0.5	1.9	28.1	4.8	6.4	75.3	4,936	576	275	133	85	297	312	-647
LaMelo Ball	2,311	126	30.9	18.3	6.4	7.0	1.6	0.4	3.1	6.6	15.3	43.1	2.5	6.6	37.8	2.7	3.2	82.6	3,890	803	884	200	48	390	373	+15
Jalen Green	2,279	118	33.0	19.3	3.7	3.1	0.7	0.3	2.4	6.7	15.8	42.1	2.5	7.2	34.2	3.6	4.5	78.8	3,890	432	361	81	30	282	189	-877
Zion Williamson	2,187	85	31.7	25.7	7.0	3.2	0.9	0.6	2.7	9.9	16.4	60.4	0.2	0.6	33.3	5.7	8.3	68.3	2,694	591	276	73	48	226	177	+151
Kevin Garnett	2,144	157	33.7	13.7	7.1	2.4	1.2	1.9	1.8	5.8	11.7	49.6	0.1	0.3	28.6	2.0	2.7	73.6	5,288	1,119	381	191	294	285	388	+116
Jayson Tatum	2,132	143	30.8	14.9	5.6	1.7	1.1	0.8	1.5	5.4	11.7	46.5	1.4	3.5	40.2	2.7	3.2	84.3	4,407	797	244	152	108	212	307	+673
Tracy McGrady	2,122	192	24.7	11.1	5.5	2.5	1.0	1.4	1.6	4.2	9.4	44.8	0.2	0.7	28.4	2.4	3.4	71.2	4,747	1,048	474	191	278	306	381	-262
Kyrie Irving	2,071	100	32.8	20.7	3.7	5.5	1.3	0.4	3.2	7.7	16.4	46.7	1.7	4.1	40.7	3.7	4.4	85.6	3,279	373	552	133	37	315	238	-274
RJ Barrett	2,067	128	32.9	16.1	5.4	2.8	0.8	0.3	2.1	5.9	14.0	42.5	1.5	4.0	37.0	2.8	4.1	68.3	4,215	693	360	108	37	263	310	-188
Jabari Smith Jr.	2,054	155	31.4	13.3	7.6	1.4	0.6	0.9	1.2	4.8	11.1	43.0	1.7	5.0	33.5	2.0	2.5	79.8	4,874	1,185	222	95	135	193	427	-639
Bradley Beal	2,029	129	33.1	15.7	3.8	2.9	0.9	0.4	1.7	5.9	14.2	41.6	1.8	4.5	39.6	2.1	2.7	78.7	4,275	484	380	121	47	218	266	+21
Stephon Marbury	2,028	118	36.3	17.2	2.7	8.0	1.2	0.2	3.2	5.9	14.2	41.5	1.4	4.1	33.5	4.0	5.6	71.5	4,286	322	939	141	23	375	301	-75
Anthony Davis	2,001	119	31.9	16.8	9.1	1.2	1.3	2.3	1.5	6.5	12.6	51.9	0.0	0.1	15.4	3.7	4.9	76.2	3,802	1,084	148	153	272	184	330	-242
Collin Sexton	1,987	116	31.5	17.1	2.9	2.8	0.7	0.1	2.2	6.5	14.9	43.7	1.3	3.5	37.3	2.8	3.3	83.2	3,652	342	322	77	8	257	258	-912
Tony Parker	1,974	159	31.7	12.4	2.6	4.8	1.0	0.1	2.2	4.7	10.6	44.7	0.9	2.7	33.1	2.1	2.8	72.7	5,041	413	766	160	11	349	340	+627
Cliff Robinson	1,955	123		15.9						6.7			0.0			2.5	3.6	69.6
Shareef Abdur-Rahim	1,946	101	35.2	19.3	7.0	2.2	1.0	0.9	2.9	7.1	15.5	45.6	0.1	0.3	24.1	5.1	6.7	75.4	3,555	711	224	96	91	289	252	-704