Dwight Howard has the most career games by a player younger than 27, with 641 games.

Interpreted as:

most regular-season games before turning 27 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	Dwight Howard D. Howard	641	36.2	18.4	13.0	1.5	1.0	2.2	6.5	11.3	57.8	0.0	0.1	5.7	5.4	9.3	58.4	60.1	3.6	9.3	3.1	23,194	11,810	8,302	971	647	1,399	1,995	2,074	+2297
2	LeBron James L. James	630	40.1	27.7	7.1	7.0	1.7	0.9	9.9	20.5	47.9	1.4	4.2	32.9	6.6	8.9	74.5	56.6	1.2	5.9	3.3	25,282	17,460	4,473	4,382	1,086	537	2,094	1,239	+2960
3	Kobe Bryant K. Bryant	627	35.0	22.4	5.1	4.4	1.5	0.6	7.8	17.3	45.2	1.0	3.0	33.3	5.8	7.0	83.1	55.0	1.3	3.8	2.8	21,962	14,034	3,209	2,788	912	401	1,780	1,673	+2212
4	Josh Smith J. Smith	613	34.0	15.1	7.9	3.1	1.3	2.2	5.8	12.6	46.4	0.3	1.2	27.9	3.1	4.6	66.7	51.7	2.1	5.8	2.5	20,848	9,253	4,867	1,897	781	1,335	1,530	1,783	+3
5	Tony Parker T. Parker	612	33.2	16.7	3.1	5.6	1.0	0.1	6.6	13.5	49.0	0.5	1.6	31.3	2.9	4.0	72.6	54.5	0.5	2.6	2.5	20,335	10,219	1,903	3,455	606	44	1,533	1,156	+3225
6	Tracy McGrady T. McGrady	612	34.8	22.2	6.4	4.4	1.4	1.1	8.0	18.2	44.0	1.2	3.6	34.4	4.9	6.4	75.8	52.6	1.8	4.6	2.3	21,302	13,570	3,906	2,680	837	663	1,388	1,220	+526
7	Kevin Garnett K. Garnett	611	38.0	19.4	10.4	4.3	1.4	1.7	7.9	16.2	48.7	0.2	0.7	30.8	3.4	4.5	75.6	53.3	2.8	7.6	2.6	23,231	11,877	6,354	2,650	848	1,053	1,568	1,556	+1650
8	Giannis Antetokounmpo G. Antetokounmpo	610	32.5	21.1	9.2	4.5	1.2	1.3	7.7	14.5	53.2	0.7	2.3	28.7	5.1	7.1	71.5	60.0	1.7	7.5	2.8	19,836	12,899	5,619	2,758	715	801	1,732	1,817	+1804
9	Andre Drummond A. Drummond	599	31.0	14.5	13.8	1.3	1.4	1.6	6.1	11.3	54.2	0.0	0.2	14.6	2.2	4.8	46.1	54.0	4.8	9.1	2.0	18,589	8,671	8,288	778	835	938	1,172	1,907	-558
10	Thaddeus Young T. Young	592	30.3	13.8	5.5	1.5	1.4	0.4	5.9	11.8	49.5	0.4	1.3	32.3	1.6	2.4	69.3	53.5	1.9	3.6	1.4	17,950	8,149	3,256	877	832	229	834	1,296	-278
11	Carmelo Anthony C. Anthony	591	36.4	24.8	6.3	3.1	1.1	0.5	8.9	19.3	45.9	0.8	2.4	32.0	6.3	7.9	80.6	54.5	1.9	4.4	3.0	21,498	14,681	3,747	1,810	659	275	1,790	1,783	+1262
12	Enes Kanter Freedom E. Kanter Freedom	583	22.2	11.9	7.6	0.8	0.4	0.4	4.9	9.0	54.1	0.1	0.2	29.4	2.1	2.7	78.0	58.4	2.9	4.7	1.6	12,949	6,946	4,436	490	236	260	922	1,296	-727
13	Bismack Biyombo B. Biyombo	583	20.3	4.9	6.3	0.5	0.3	1.4	1.9	3.6	51.7	0.0	0.0	0.0	1.2	2.2	57.1	54.5	1.9	4.3	0.9	11,836	2,880	3,660	288	149	803	529	1,292	-1738
14	Andrew Wiggins A. Wiggins	579	35.1	19.4	4.4	2.3	1.0	0.7	7.2	16.1	44.9	1.4	4.0	35.1	3.6	4.9	72.7	53.1	1.2	3.2	2.0	20,319	11,220	2,553	1,348	573	386	1,159	1,242	-430
15	Chris Bosh C. Bosh	576	36.9	20.0	9.3	2.1	0.8	1.1	7.1	14.3	49.2	0.1	0.3	29.0	5.8	7.2	79.8	57.0	2.6	6.7	2.2	21,244	11,513	5,331	1,238	452	644	1,244	1,476	+731
16	Spencer Hawes S. Hawes	573	23.9	9.2	6.0	1.9	0.4	1.0	3.8	8.3	45.9	0.5	1.5	35.1	1.0	1.4	69.9	51.1	1.6	4.5	1.5	13,710	5,255	3,458	1,081	227	595	864	1,521	-1557
17	Jayson Tatum J. Tatum	571	34.5	23.5	7.3	3.8	1.1	0.7	8.2	17.7	45.9	2.6	7.1	37.2	4.5	5.4	83.9	58.3	0.9	6.4	2.4	19,676	13,406	4,182	2,151	627	377	1,348	1,204	+3524
18	Kevin Durant K. Durant	569	38.0	27.3	6.9	3.5	1.2	1.0	9.2	19.1	48.1	1.7	4.4	37.9	7.3	8.3	88.1	60.1	0.8	6.1	3.2	21,629	15,537	3,929	2,002	705	554	1,833	1,076	+1317
19	Jarrett Allen J. Allen	568	28.2	12.8	9.2	1.7	0.7	1.2	5.1	8.0	64.1	0.0	0.2	16.4	2.5	3.6	71.2	67.0	2.9	6.4	1.4	16,020	7,288	5,239	948	371	703	767	1,113	+772
20	Darryl Dawkins D. Dawkins	565		11.6	6.5				4.7			0.0			2.1	3.2	66.9						6,539	3,683
21	Jermaine O'Neal J. O'Neal	563	26.6	13.3	7.4	1.2	0.5	1.8	5.1	11.0	46.4	0.0	0.1	15.9	3.0	4.4	69.0	51.2	2.1	5.3	1.7	14,966	7,463	4,164	673	276	1,012	970	1,562	+802
22	Marvin Williams M. Williams	560	29.6	11.0	5.1	1.3	0.8	0.4	3.9	8.8	44.7	0.5	1.5	32.8	2.6	3.3	80.5	53.7	1.3	3.8	1.1	16,550	6,145	2,845	731	422	251	640	1,216	-269
23	Shawn Kemp S. Kemp	558	29.3	16.1	9.6	1.7	1.2	1.6	5.8	11.2	52.3	0.0	0.1	22.4	4.3	6.0	72.8	58.2	3.4	6.1	2.8	16,348	8,964	5,329	965	677	893	1,568	2,119	+91
24	Rashard Lewis R. Lewis	557	33.3	16.0	5.7	1.6	1.1	0.6	5.9	12.8	46.1	1.5	3.8	38.6	2.7	3.4	79.4	55.8	1.7	4.1	1.6	18,573	8,909	3,199	906	640	323	866	1,334	+433
25	Derrick Favors D. Favors	556	26.1	11.6	7.2	1.1	0.8	1.3	4.7	9.0	51.7	0.0	0.2	20.2	2.2	3.3	66.3	55.1	2.5	4.7	1.5	14,501	6,423	3,987	612	442	707	811	1,501	-240