Dwight Howard has grabbed the most career boards by a player younger than 31, with 11,428 rebounds.

Interpreted as:

NBA most rebounds by a player before the age of 31

	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	11,428	902	35.1	17.7	12.7	1.5	1.0	2.1	6.3	10.9	58.2	0.0	0.1	9.3	5.0	8.8	56.7	59.9	3.5	9.1	3.0	31,703	15,952	1,348	890	1,859	2,721	2,963	+2946
2	Andre Drummond A. Drummond	10,671	864	27.2	12.7	12.4	1.2	1.3	1.3	5.4	9.9	54.3	0.0	0.1	12.5	2.0	4.2	48.2	54.4	4.2	8.1	1.8	23,467	11,000	1,073	1,094	1,130	1,567	2,505	-572
3	Kevin Garnett K. Garnett	10,542	927	38.3	20.5	11.4	4.5	1.4	1.7	8.2	16.6	49.1	0.2	0.6	28.9	4.0	5.2	78.0	54.3	2.8	8.6	2.6	35,536	19,041	4,146	1,282	1,576	2,387	2,355	+2453
4	Hakeem Olajuwon H. Olajuwon	8,957	713	37.3	23.4	12.6	2.4	1.9	3.6	9.3	18.0	51.6	0.0	0.1	9.3	4.9	6.9	70.3	55.7	4.0	8.5	3.2	26,563	16,709	1,723	1,385	2,576	2,261	2,812
5	DeAndre Jordan D. Jordan	8,890	819	28.2	9.6	10.9	0.9	0.6	1.6	3.8	5.7	67.0	0.0	0.0	9.1	1.9	4.0	46.6	63.7	3.2	7.6	1.4	23,092	7,836	713	490	1,349	1,135	2,182	+1506
6	Tim Duncan T. Duncan	8,866	746	37.5	21.8	11.9	3.2	0.8	2.5	8.4	16.4	50.9	0.0	0.2	19.7	5.1	7.5	68.0	55.4	3.2	8.7	2.9	27,966	16,288	2,365	595	1,840	2,152	2,036	+5589
7	Shaquille O'Neal S. O'Neal	8,744	719	37.8	27.5	12.2	2.9	0.7	2.6	10.9	19.0	57.6	0.0	0.0	5.0	5.7	10.5	53.9	58.3	4.0	8.2	2.9	27,151	19,781	2,050	512	1,879	2,070	2,446	+3134
8	Giannis Antetokounmpo G. Antetokounmpo	8,702	876	32.8	24.0	9.9	5.0	1.1	1.2	8.8	15.9	55.2	0.6	2.2	28.6	5.8	8.3	69.2	61.2	1.9	8.0	3.0	28,728	21,030	4,392	977	1,080	2,642	2,578	+3109
9	Nikola Jokić N. Jokić	8,423	768	31.8	22.0	11.0	7.3	1.3	0.7	8.4	15.0	56.1	1.1	3.1	36.2	4.0	4.8	82.5	64.1	2.7	8.3	2.9	24,441	16,881	5,636	980	554	2,257	2,060	+4294
10	Charles Barkley C. Barkley	8,366	718	37.3	23.5	11.7	3.9	1.7	1.0	8.4	14.8	56.7	0.4	1.7	25.9	6.3	8.6	73.3	63.3	4.2	7.4	3.4	26,786	16,893	2,819	1,185	704	2,463	2,320
11	Karl Malone K. Malone	8,058	734	37.6	26.0	11.0	3.0	1.4	0.8	9.6	18.2	52.5	0.1	0.2	25.6	6.8	9.4	71.9	58.0	2.9	8.1	3.3	27,564	19,050	2,185	1,039	615	2,396	2,481
12	Rudy Gobert R. Gobert	7,933	681	30.0	12.5	11.6	1.3	0.7	2.1	4.6	7.1	65.4	0.0	0.0	0.0	3.3	5.1	63.9	67.1	3.3	8.3	1.7	20,448	8,531	894	468	1,452	1,130	1,789	+2723
13	Buck Williams B. Williams	7,907	692	36.0	15.8	11.4	1.5			6.0	10.9	55.0	0.0			3.9	5.9	65.9	58.8				24,898	10,959	1,059				2,417
14	Shawn Kemp S. Kemp	7,900	844	30.4	16.6	9.4	1.8	1.2	1.4	5.9	11.9	49.6	0.0	0.1	28.2	4.8	6.4	74.0	56.3	3.3	6.1	3.0	25,623	14,043	1,550	1,047	1,201	2,518	3,275	+557
15	Charles Oakley C. Oakley	7,888	724	32.0	11.0	10.9	2.4	1.0	0.3	4.2	8.5	49.5	0.0	0.1	24.3	2.6	3.5	73.9	54.9	3.8	7.1	2.5	23,183	7,999	1,751	748	191	1,824	2,520
16	Anthony Davis A. Davis	7,638	722	34.5	24.1	10.6	2.5	1.3	2.3	9.0	17.2	52.2	0.5	1.5	29.7	5.6	7.0	79.5	59.1	2.6	7.9	2.0	24,898	17,376	1,788	956	1,679	1,425	1,713	+783
17	Karl-Anthony Towns K. Towns	7,413	668	34.0	23.0	11.1	3.2	0.8	1.2	8.4	16.1	52.2	1.7	4.4	39.8	4.5	5.3	83.9	62.3	2.8	8.3	2.7	22,730	15,388	2,112	542	789	1,803	2,275	+1467
18	Kevin Love K. Love	7,397	657	32.0	18.3	11.3	2.3	0.7	0.5	6.0	13.6	44.2	1.6	4.4	37.0	4.6	5.6	82.7	56.9	2.9	8.3	1.9	21,022	12,006	1,518	453	303	1,271	1,409	+805
19	Shawn Marion S. Marion	7,384	745	37.6	17.8	9.9	2.0	1.8	1.3	7.2	14.9	48.1	0.9	2.7	33.7	2.5	3.1	82.0	54.6	2.6	7.3	1.6	28,021	13,254	1,511	1,363	975	1,192	1,869	+2061
20	Jonas Valančiūnas J. Valančiūnas	7,375	774	26.0	13.5	9.5	1.2	0.4	1.0	5.4	9.6	56.1	0.2	0.7	35.7	2.5	3.2	78.9	61.5	2.8	6.7	1.7	20,109	10,434	964	310	754	1,300	2,227	+698
21	Chris Bosh C. Bosh	7,202	840	35.9	19.3	8.6	2.0	0.8	1.1	7.0	14.1	49.5	0.3	0.8	32.6	5.1	6.3	79.9	57.1	2.2	6.3	2.1	30,157	16,179	1,667	694	898	1,729	2,058	+2036
22	Dirk Nowitzki D. Nowitzki	7,182	839	36.6	22.7	8.6	2.7	0.9	1.0	7.9	16.7	47.2	1.3	3.4	37.8	5.7	6.5	87.2	58.1	1.3	7.3	1.9	30,693	19,084	2,247	776	857	1,618	2,178	+4648
23	Tyson Chandler T. Chandler	7,168	790	28.5	8.7	9.1	0.8	0.6	1.3	3.2	5.5	58.4	0.0	0.0	0.0	2.3	3.6	63.9	61.5	3.2	5.9	1.5	22,506	6,882	634	440	1,055	1,213	2,435	+795
24	Al Jefferson A. Jefferson	7,084	785	30.9	16.9	9.0	1.6	0.7	1.3	7.2	14.5	49.9	0.0	0.1	12.9	2.4	3.4	70.8	52.7	2.4	6.6	1.4	24,267	13,232	1,220	577	1,033	1,137	2,085	-1752
25	Domantas Sabonis D. Sabonis	7,015	657	30.8	16.1	10.7	4.9	0.8	0.5	6.3	11.3	55.9	0.5	1.4	34.4	3.0	4.2	72.9	61.5	2.7	8.0	2.6	20,263	10,590	3,202	508	299	1,690	2,062	+564