Dwight Howard has the most career boards by a player younger than 38, with 14,627 rebounds.

Interpreted as:

most rebounds before turning 38 years old by a player

	NAME	REB	GP	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	Dwight Howard D. Howard	14,627	1,242	31.8	15.7	11.8	1.3	0.9	1.8	5.7	9.7	58.7	0.0	0.1	21.4	4.3	7.6	56.7	60.2	3.3	8.4	2.7	39,434	19,485	1,676	1,081	2,228	3,302	3,912	+2878
2	Kevin Garnett K. Garnett	14,201	1,377	35.5	18.6	10.3	3.9	1.3	1.5	7.5	15.0	49.7	0.1	0.5	27.7	3.5	4.4	79.0	54.7	2.3	8.0	2.3	48,910	25,626	5,306	1,785	2,010	3,117	3,382	+4878
3	Tim Duncan T. Duncan	13,940	1,254	34.8	19.9	11.1	3.1	0.7	2.2	7.7	15.2	50.6	0.0	0.1	17.6	4.4	6.4	69.4	55.1	2.9	8.3	2.5	43,605	24,904	3,832	915	2,791	3,160	3,014	+8179
4	Karl Malone K. Malone	13,287	1,273	37.3	25.9	10.4	3.4	1.4	0.8	9.5	18.2	52.4	0.1	0.2	27.0	6.8	9.2	73.8	58.2	2.5	7.9	3.1	47,505	32,919	4,365	1,749	1,035	3,948	4,028	+2569
5	Hakeem Olajuwon H. Olajuwon	13,135	1,148	36.6	22.8	11.4	2.6	1.8	3.2	9.1	17.6	51.3	0.0	0.1	20.5	4.6	6.5	71.5	55.5	3.4	8.1	3.1	42,042	26,119	2,953	2,052	3,684	3,528	4,164	+447
6	Shaquille O'Neal S. O'Neal	12,921	1,170	35.2	24.1	11.0	2.6	0.6	2.3	9.6	16.5	58.1	0.0	0.0	4.5	5.0	9.5	52.7	58.5	3.6	7.5	2.8	41,166	28,255	3,000	723	2,690	3,254	4,026	+4694
7	Charles Barkley C. Barkley	12,546	1,073	36.6	22.1	11.7	3.9	1.5	0.8	7.9	14.5	54.1	0.5	1.9	26.6	5.9	8.1	73.5	61.2	4.0	7.7	3.1	39,325	23,757	4,215	1,649	888	3,374	3,286	+532
8	Buck Williams B. Williams	11,992	1,221	32.4	12.7	9.8	1.3			4.8	8.8	54.6	0.0			3.1	4.6	66.7	58.6				39,547	15,490	1,540				3,966	+134
9	Charles Oakley C. Oakley	11,923	1,198	32.5	10.2	10.0	2.6	1.1	0.3	4.0	8.4	47.3	0.1	0.2	25.4	2.2	2.9	76.0	52.7	3.2	6.7	2.3	38,959	12,194	3,116	1,312	371	2,713	4,205	+292
10	Dennis Rodman D. Rodman	11,783	899	31.6	7.4	13.1	1.8	0.7	0.6	3.1	5.9	52.2	0.1	0.4	23.2	1.2	2.0	58.3	54.7	4.8	8.3	1.6	28,449	6,649	1,586	609	530	1,465	2,802	+903
11	Pau Gasol P. Gasol	11,168	1,196	34.0	17.4	9.3	3.2	0.5	1.6	6.6	13.1	50.8	0.1	0.4	36.6	4.0	5.2	75.4	56.5	2.6	6.8	2.2	40,641	20,776	3,873	601	1,926	2,622	2,603	+1859
12	Andre Drummond A. Drummond	11,152	920	26.7	12.4	12.1	1.2	1.2	1.3	5.2	9.6	54.2	0.0	0.2	16.7	2.0	4.0	48.7	54.5	4.2	8.0	1.8	24,604	11,425	1,118	1,145	1,164	1,637	2,637	-814
13	Dikembe Mutombo D. Mutombo	10,907	929	35.1	11.7	11.7	1.3	0.5	3.2	4.2	8.1	51.8	0.0	0.0	0.0	3.4	4.9	68.0	57.2	3.6	8.2	2.2	32,620	10,874	1,208	428	2,996	2,026	2,898	+1332
14	DeAndre Jordan D. Jordan	10,795	1,113	25.1	8.5	9.7	0.9	0.5	1.4	3.5	5.1	67.4	0.0	0.0	15.4	1.6	3.4	47.5	64.4	2.9	6.8	1.3	27,890	9,492	1,045	571	1,567	1,443	2,685	+998
15	Patrick Ewing P. Ewing	10,759	1,039	36.2	22.8	10.4	2.0	1.0	2.7	8.9	17.5	50.8	0.0	0.1	15.6	4.9	6.6	74.2	55.6	2.5	7.9	3.2	37,586	23,665	2,088	1,061	2,758	3,318	3,676	+591
16	Kevin Willis K. Willis	10,662	1,141	29.9	13.7	9.3	1.1	0.7	0.6	5.6	11.5	49.2	0.0	0.2	21.9	2.4	3.4	71.3	52.9	3.2	6.1	2.0	34,067	15,656	1,219	824	638	2,282	3,613	-200
17	Dirk Nowitzki D. Nowitzki	10,540	1,340	35.3	22.0	7.9	2.5	0.8	0.9	7.8	16.4	47.4	1.3	3.3	38.1	5.2	5.9	87.9	58.0	1.1	6.8	1.8	47,249	29,491	3,414	1,128	1,180	2,374	3,266	+6677
18	David Robinson D. Robinson	10,497	987	34.7	21.1	10.6	2.5	1.4	3.0	7.5	14.4	51.8	0.0	0.1	25.0	6.1	8.3	73.6	58.3	3.1	7.5	2.4	34,271	20,790	2,441	1,388	2,954	2,417	2,835	+2454
19	Ben Wallace B. Wallace	10,482	1,088	29.5	5.7	9.6	1.3	1.3	2.0	2.4	5.0	47.4	0.0	0.0	13.7	1.0	2.5	41.4	47.4	3.2	6.5	1.0	32,085	6,254	1,437	1,369	2,137	1,061	2,078	+2103
20	Tyson Chandler T. Chandler	10,467	1,160	27.3	8.2	9.0	0.8	0.5	1.2	3.1	5.1	59.7	0.0	0.0	0.0	2.1	3.2	64.4	62.6	3.0	6.0	1.4	31,614	9,509	967	630	1,335	1,656	3,268	+321
21	LeBron James L. James	10,428	1,393	38.1	27.1	7.5	7.3	1.6	0.8	9.9	19.7	50.5	1.6	4.6	34.5	5.7	7.8	73.4	58.8	1.2	6.3	3.5	53,104	37,813	10,222	2,165	1,057	4,873	2,567	+7017
22	Nikola Vučević N. Vučević	10,324	988	31.4	17.2	10.4	2.9	0.8	0.9	7.3	14.7	49.7	0.9	2.7	35.0	1.6	2.1	77.1	55.0	2.5	7.9	1.7	30,993	16,986	2,867	831	851	1,696	2,397	-1528
23	Otis Thorpe O. Thorpe	10,222	1,208	32.4	14.5	8.5	2.2	0.7	0.4	5.6	10.3	54.7	0.0	0.1	4.7	3.2	4.6	68.6	58.5	2.8	5.6	2.3	39,171	17,464	2,701	829	494	2,740	4,038	-413
24	Zach Randolph Z. Randolph	10,208	1,116	31.0	16.6	9.1	1.8	0.7	0.3	6.7	14.1	47.1	0.2	0.7	27.3	3.1	4.1	76.4	52.2	2.9	6.2	2.1	34,615	18,578	2,049	834	301	2,290	2,629	-333
25	Shawn Marion S. Marion	10,101	1,163	34.5	15.2	8.7	1.9	1.5	1.1	6.3	12.9	48.4	0.7	2.1	33.1	2.0	2.5	81.0	54.2	2.3	6.3	1.5	40,098	17,700	2,198	1,759	1,233	1,750	2,535	+1971