Andre Drummond has the most games by a player younger than 25 with 20+ rebounds, with 51 games.

Interpreted as:

most 20 or more rebound regular-season games by a player before 25 age

	NAME	GP	REB	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	AST	STL	BLK	TOV	PF	+/-
1	Andre Drummond A. Drummond	51	1,115	37.1	18.9	21.9	1.9	1.7	1.9	8.0	14.7	54.5	0.0	0.1	0.0	2.9	6.3	45.5	54.0	7.5	14.4	2.2	1,894	965	96	86	99	110	156	+235
2	Dwight Howard D. Howard	40	856	40.2	21.2	21.4	1.4	1.3	3.0	7.3	13.1	55.7	0.0	0.1	0.0	6.7	11.1	60.0	59.1	5.9	15.5	3.5	1,609	848	56	51	120	140	125	+344
3	Charles Barkley C. Barkley	20	440	44.0	26.9	22.0	5.1	2.1	2.3	9.5	16.7	57.1	0.3	1.5	17.2	7.7	9.8	78.5	64.2	8.5	13.6	5.7	879	538	102	42	45	114	77
4	Kevin Love K. Love	18	401	40.0	24.7	22.3	2.3	0.8	0.9	8.1	17.6	45.7	1.2	3.6	32.3	7.4	9.2	81.2	57.1	6.4	15.8	2.2	720	445	42	14	16	39	35	+57
5	Shaquille O'Neal S. O'Neal	18	392	42.0	29.4	21.8	2.5	0.6	4.3	11.8	19.6	60.5	0.0	0.1	0.0	5.8	10.3	56.2	61.1	7.4	14.3	3.4	756	530	45	10	77	61	58	+29
6	Karl-Anthony Towns K. Towns	14	304	37.8	26.9	21.7	3.6	0.7	1.2	10.6	17.6	59.9	1.8	4.0	44.6	4.0	4.9	81.2	68.0	4.5	17.2	3.7	529	377	51	10	17	52	53	+82
7	Charles Oakley C. Oakley	14	312	39.5	17.8	22.3	3.6	1.4	0.7	6.9	15.1	46.0	0.0	0.3	0.0	3.9	5.0	78.6	51.5	8.4	13.9	3.8	553	249	50	20	10	53	50
8	Tyson Chandler T. Chandler	13	276	36.8	14.8	21.2	1.1	0.6	2.3	5.7	11.2	51.0	0.0	0.1	0.0	3.5	5.5	62.5	54.6	8.9	12.3	1.4	478	193	14	8	30	18	36	+106
9	Hakeem Olajuwon H. Olajuwon	13	279	40.3	26.8	21.5	2.3	2.3	3.8	10.6	20.6	51.5	0.0	0.0		5.5	9.1	61.0	54.4	8.8	12.6	3.2	524	348	30	30	50	42	53
10	Roy Tarpley R. Tarpley	10	215	36.8	20.0	21.5	1.1	1.2	2.0	8.0	16.8	47.6	0.0	0.0		4.0	6.1	65.6	51.3	8.0	13.5	3.5	368	200	11	12	20	35	34
11	DeMarcus Cousins D. Cousins	9	187	38.8	28.6	20.8	4.3	1.4	2.1	11.0	21.9	50.3	0.0	0.1	0.0	6.6	9.9	66.3	54.4	6.1	14.7	4.0	349	257	39	13	19	36	34	+14
12	Buck Williams B. Williams	9	187	40.4	19.9	20.8	1.3		1.8	8.0	14.0	57.1	0.0	0.0		3.9	6.7	58.3	58.7	6.8	14.0		364	179	12		16		28
13	Tim Duncan T. Duncan	8	171	45.4	26.9	21.4	2.0	0.6	2.8	10.3	19.8	51.9	0.3	0.4	66.7	6.1	10.1	60.5	55.5	5.8	15.6	4.0	363	215	16	5	22	32	24	+21
14	Clint Capela C. Capela	7	154	35.6	21.0	22.0	1.6	0.9	2.0	9.0	14.0	64.3	0.0	0.0		3.0	4.6	65.6	65.6	8.6	13.4	1.9	249	147	11	6	14	13	14	+27
15	Nikola Vučević N. Vučević	7	158	40.7	23.6	22.6	3.1	1.0	1.6	10.4	19.3	54.1	0.0	0.0		2.7	3.6	76.0	56.5	7.7	14.9	2.0	285	165	22	7	11	14	24	+29
16	Elton Brand E. Brand	7	148	43.9	25.7	21.1	3.0	1.1	2.0	10.4	18.3	57.0	0.0	0.0		4.9	6.7	72.3	60.5	8.3	12.9	2.4	307	180	21	8	14	17	25	+34
17	Nikola Jokić N. Jokić	6	124	34.8	22.5	20.7	7.8	1.5	0.7	9.0	17.0	52.9	0.5	2.3	21.4	4.0	4.8	82.8	58.8	4.3	16.3	3.5	209	135	47	9	4	21	20	+65
18	Anthony Davis A. Davis	6	125	40.7	33.0	20.8	2.7	0.8	1.8	12.5	20.7	60.5	1.3	2.0	66.7	6.7	8.0	83.3	68.2	4.8	16.0	2.7	244	198	16	5	11	16	10	+40
19	Kevin Garnett K. Garnett	6	124	45.8	24.7	20.7	4.8	0.8	2.2	10.0	20.5	48.8	0.5	0.8	60.0	4.2	5.3	78.1	54.0	7.0	13.7	3.0	275	148	29	5	13	18	15	+4
20	Cliff Robinson C. Robinson	6	130	41.7	23.0	21.7	1.8	0.3	2.0	9.8	18.7	52.7	0.2	0.3	50.0	3.2	4.5	70.4	55.7	3.7	18.0	2.8	250	138	11	2	12	17	15
21	Jalen Duren J. Duren	5	110	32.2	22.0	22.0	3.6	0.2	1.4	8.6	13.0	66.2	0.0	0.2	0.0	4.8	6.2	77.4	69.9	9.0	13.0	2.0	161	110	18	1	7	10	15	+25
22	Rudy Gobert R. Gobert	5	114	36.9	17.2	22.8	2.0	0.4	2.0	6.4	9.6	66.7	0.0	0.0		4.4	6.8	64.7	68.3	7.4	15.4	1.6	185	86	10	2	10	8	12	+53
23	Joakim Noah J. Noah	5	103	36.8	12.2	20.6	2.2	0.8	2.2	4.8	11.6	41.4	0.0	0.0		2.6	3.4	76.5	46.6	8.0	12.6	3.4	184	61	11	4	11	17	19	+23
24	Andris Biedrins A. Biedrins	5	110	39.1	16.0	22.0	2.0	1.2	0.6	7.2	12.2	59.0	0.0	0.0		1.6	3.4	47.1	58.4	7.0	15.0	2.0	195	80	10	6	3	10	19	+25
25	Al Jefferson A. Jefferson	5	104	38.7	25.6	20.8	2.0	2.0	1.6	10.8	22.8	47.4	0.0	0.0		4.0	5.4	74.1	50.8	6.0	14.8	2.4	193	128	10	10	8	12	12	+2