Tracy McGrady has the most career games by a player younger than 22, with 269 games.

Interpreted as:

most regular-season game before turning 22 years old by a player

	NAME	GP	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
1	Tracy McGrady T. McGrady	269	29.1	15.6	6.1	3.1	1.1	1.5	5.9	13.1	45.2	0.4	1.1	32.2	3.3	4.6	72.2	51.4	2.2	3.8	1.9	7,834	4,187	1,628	826	307	396	504	541	-10
2	Dwight Howard D. Howard	267	35.7	15.8	11.9	1.5	0.9	1.8	5.7	10.2	56.0	0.0	0.0	12.5	4.4	7.2	61.1	59.2	3.5	8.4	2.9	9,520	4,210	3,169	388	229	468	776	826	+108
3	LeBron James L. James	266	41.3	26.6	6.6	6.5	1.8	0.7	9.6	20.9	46.1	1.3	3.8	33.3	6.1	8.2	74.2	54.3	1.2	5.5	3.3	10,999	7,067	1,763	1,739	471	199	891	534	+393
4	Kobe Bryant K. Bryant	266	28.5	15.9	4.0	3.0	1.1	0.7	5.6	12.4	45.0	0.7	2.3	33.1	4.0	5.0	81.6	54.7	1.1	2.9	2.3	7,579	4,240	1,054	803	301	175	608	655	+947
5	Giannis Antetokounmpo G. Antetokounmpo	257	30.8	13.0	6.5	3.2	1.0	1.2	4.8	9.8	48.8	0.3	1.2	27.7	3.1	4.2	72.8	55.7	1.2	5.2	2.2	7,910	3,330	1,660	813	268	301	567	758	-259
6	Andris Biedrins A. Biedrins	248	22.5	7.4	7.2	0.8	0.6	1.2	3.2	5.3	61.1	0.0	0.0	0.0	0.9	1.7	51.4	60.8	2.6	4.7	1.0	5,578	1,827	1,789	193	151	288	239	815	+400
7	Josh Smith J. Smith	242	32.3	12.7	7.1	2.5	1.0	2.5	4.7	10.7	43.4	0.3	1.3	26.3	3.0	4.2	70.6	50.2	2.1	5.0	2.4	7,816	3,066	1,725	612	254	615	578	705	-905
8	Kevin Garnett K. Garnett	239	35.6	15.3	8.0	3.1	1.4	1.9	6.5	13.1	49.4	0.1	0.3	26.2	2.3	3.2	73.7	52.9	2.5	5.5	2.0	8,510	3,662	1,905	729	330	444	477	612	+268
9	Eddy Curry E. Curry	238	21.9	10.8	4.8	0.6	0.3	0.9	4.2	8.1	52.0	0.0	0.0	100.0	2.3	3.5	65.4	55.6	1.7	3.2	1.8	5,211	2,561	1,152	140	60	204	421	698	-816
10	Carmelo Anthony C. Anthony	237	36.1	22.8	5.6	2.7	1.1	0.5	8.1	18.0	44.8	0.6	2.2	28.2	6.1	7.6	79.5	53.4	1.9	3.7	2.9	8,544	5,405	1,318	637	253	113	689	683	+235
11	Kevin Durant K. Durant	236	37.7	25.3	6.2	2.7	1.2	0.9	8.7	18.7	46.2	1.2	3.3	36.1	6.8	7.7	88.2	57.1	1.1	5.1	3.1	8,892	5,967	1,453	628	286	212	728	427	-721
12	Tony Parker T. Parker	234	32.6	13.1	2.8	5.0	0.9	0.1	5.0	11.2	44.7	0.9	2.7	32.5	2.2	3.1	71.7	52.2	0.5	2.3	2.3	7,618	3,073	650	1,177	221	18	528	488	+1021
13	Darius Miles D. Miles	230	27.7	9.4	5.6	2.0	0.8	1.3	3.9	8.3	46.5	0.0	0.2	7.7	1.6	2.8	57.7	49.1	1.5	4.1	2.1	6,368	2,158	1,293	459	189	297	485	534	-388
14	Chris Bosh C. Bosh	224	36.7	16.8	8.5	1.8	0.8	1.3	6.0	12.4	48.2	0.0	0.2	22.2	4.8	6.3	77.0	55.4	2.6	5.9	2.0	8,226	3,773	1,906	412	183	296	449	646	-262
15	Anthony Edwards A. Edwards	223	34.2	21.8	5.1	3.7	1.4	0.6	7.9	17.9	44.1	2.7	7.6	35.2	3.4	4.4	77.0	55.0	0.8	4.3	2.7	7,621	4,871	1,137	836	312	140	609	479	+57
16	Andre Drummond A. Drummond	223	28.5	12.1	11.8	0.5	1.0	1.7	5.3	9.3	57.0	0.0	0.0	16.7	1.5	3.8	39.7	55.2	4.7	7.1	1.3	6,364	2,701	2,632	120	233	379	287	702	-338
17	Marvin Williams M. Williams	223	30.9	12.1	5.3	1.4	0.8	0.4	4.3	9.7	44.8	0.1	0.5	23.1	3.3	4.2	79.9	52.6	1.5	3.8	1.5	6,896	2,696	1,177	321	181	87	337	643	-441
18	Andrew Wiggins A. Wiggins	220	36.1	19.9	4.1	2.2	1.0	0.5	7.2	15.9	45.3	0.8	2.4	32.4	4.8	6.3	75.9	53.5	1.4	2.7	2.2	7,933	4,384	902	476	216	118	490	476	-623
19	Bismack Biyombo B. Biyombo	220	21.4	4.3	6.0	0.3	0.3	1.6	1.7	3.5	48.6	0.0	0.0		0.9	1.7	50.5	50.1	1.9	4.1	0.9	4,714	935	1,316	70	55	344	193	464	-875
20	Derrick Favors D. Favors	220	21.4	8.3	6.3	0.7	0.6	1.2	3.2	6.5	49.8	0.0	0.0	0.0	1.9	2.9	65.1	53.7	2.3	4.0	1.4	4,698	1,830	1,383	157	134	263	309	638	-261
21	Jrue Holiday J. Holiday	220	31.2	11.9	3.3	5.0	1.4	0.3	4.7	10.7	44.0	0.9	2.5	37.7	1.5	1.9	79.8	51.5	0.8	2.5	2.3	6,864	2,611	735	1,101	302	65	509	493	+229
22	Spencer Hawes S. Hawes	220	23.2	8.8	5.5	1.6	0.4	1.0	3.8	8.1	46.6	0.3	1.0	31.4	0.9	1.4	67.0	50.4	1.6	3.9	1.6	5,094	1,933	1,215	351	90	216	347	577	-855
23	Luol Deng L. Deng	220	33.2	15.2	6.4	2.2	1.0	0.6	6.1	12.7	48.0	0.2	0.9	26.5	2.7	3.6	76.0	53.1	1.7	4.7	1.7	7,303	3,348	1,406	484	215	125	372	387	+688
24	Stanley Johnson S. Johnson	219	22.6	7.0	3.4	1.5	0.9	0.2	2.6	7.0	37.0	0.8	2.7	29.5	1.0	1.4	76.0	46.2	0.6	2.8	1.2	4,951	1,531	747	335	206	50	262	468	-181
25	Martell Webster M. Webster	218	22.8	8.2	3.1	0.8	0.4	0.3	2.8	6.9	40.8	1.3	3.4	37.2	1.3	1.7	74.8	53.6	0.6	2.5	0.9	4,962	1,777	666	176	98	61	202	375	-480