Tim Duncan has the highest career plus/minus by a player younger than 31, at +5589.

Interpreted as:

best plus minus by a player before age 31

	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	Tim Duncan T. Duncan	+5589	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	8,866	2,365	595	1,840	2,152	2,036
2	LeBron James L. James	+5298	940	39.2	27.3	7.1	6.9	1.7	0.8	9.8	19.8	49.6	1.4	4.0	33.9	6.3	8.5	74.4	58.0	1.2	6.0	3.4	36,814	25,657	6,716	6,475	1,595	744	3,170	1,755
3	Dirk Nowitzki D. Nowitzki	+4648	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	7,182	2,247	776	857	1,618	2,178
4	Tony Parker T. Parker	+4620	872	32.9	17.1	3.0	6.0	1.0	0.1	6.8	13.7	49.4	0.4	1.4	31.3	3.1	4.2	74.8	55.0	0.4	2.6	2.5	28,688	14,917	2,645	5,247	836	66	2,205	1,554
5	Stephen Curry S. Curry	+4482	681	34.4	23.5	4.5	6.6	1.7	0.2	8.1	17.1	47.7	3.5	8.1	43.5	3.7	4.1	90.5	62.3	0.7	3.8	3.1	23,454	15,994	3,058	4,520	1,181	149	2,132	1,697
6	Nikola Jokić N. Jokić	+4294	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	8,423	5,636	980	554	2,257	2,060
7	Kobe Bryant K. Bryant	+3886	948	36.4	25.1	5.3	4.6	1.5	0.6	8.7	19.2	45.5	1.3	3.7	34.1	6.4	7.7	84.0	55.8	1.2	4.1	2.9	34,531	23,820	5,019	4,401	1,441	544	2,752	2,527
8	Kawhi Leonard K. Leonard	+3689	576	31.3	19.2	6.4	2.9	1.8	0.6	6.9	14.0	49.3	1.5	3.9	38.4	3.9	4.5	85.8	60.0	1.2	5.2	1.6	18,024	11,085	3,689	1,672	1,013	367	933	988
9	Kevin Durant K. Durant	+3678	849	36.9	27.0	7.1	4.1	1.1	1.1	9.2	18.7	49.3	1.8	4.9	38.1	6.8	7.7	88.3	61.3	0.7	6.3	3.1	31,304	22,940	5,992	3,486	948	941	2,653	1,618
10	Klay Thompson K. Thompson	+3676	615	33.1	19.5	3.5	2.3	0.9	0.5	7.3	16.0	45.9	2.9	7.0	41.9	1.9	2.3	84.8	57.5	0.4	3.0	1.7	20,340	11,995	2,130	1,416	561	332	1,053	1,313
11	Jayson Tatum J. Tatum	+3645	585	34.5	23.6	7.3	3.8	1.1	0.7	8.2	17.8	45.9	2.6	7.1	37.0	4.5	5.4	84.0	58.3	0.9	6.5	2.4	20,184	13,784	4,293	2,243	640	384	1,389	1,232
12	Draymond Green D. Green	+3457	607	28.2	8.8	6.8	5.1	1.4	1.0	3.2	7.4	43.4	0.9	2.8	31.6	1.5	2.1	71.0	52.9	1.1	5.7	2.1	17,118	5,347	4,154	3,122	833	631	1,271	1,692
13	Chris Paul C. Paul	+3439	773	35.9	18.8	4.4	9.9	2.3	0.1	6.6	14.0	47.3	1.1	3.1	36.5	4.4	5.1	86.4	57.8	0.7	3.7	2.4	27,725	14,506	3,380	7,688	1,793	82	1,877	1,909
14	James Harden J. Harden	+3423	833	34.3	25.2	5.3	6.3	1.6	0.5	7.4	16.7	44.3	2.8	7.7	36.3	7.6	8.8	85.8	61.1	0.8	4.6	3.7	28,587	20,962	4,446	5,255	1,314	443	3,078	2,204
15	Russell Westbrook R. Westbrook	+3142	830	34.5	23.0	7.0	8.4	1.8	0.3	8.1	18.6	43.5	1.1	3.7	30.7	5.7	7.1	80.0	52.9	1.7	5.4	4.1	28,625	19,056	5,838	6,964	1,460	254	3,367	2,092
16	Shaquille O'Neal S. O'Neal	+3134	424	37.7	27.7	11.9	3.1	0.6	2.5	11.0	19.1	57.3	0.0	0.0	0.0	5.8	10.9	53.4	58.0	3.8	8.1	2.8	15,987	11,762	5,053	1,334	269	1,055	1,182	1,393
17	Giannis Antetokounmpo G. Antetokounmpo	+3109	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	8,702	4,392	977	1,080	2,642	2,578
18	Rasheed Wallace R. Wallace	+2956	646	35.2	16.4	7.1	2.0	1.0	1.3	6.5	13.4	48.8	0.7	2.2	33.1	2.6	3.6	71.2	54.6	1.7	5.4	1.8	22,711	10,586	4,602	1,286	645	858	1,193	1,924
19	Dwight Howard D. Howard	+2946	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	11,428	1,348	890	1,859	2,721	2,963
20	Donovan Mitchell D. Mitchell	+2741	562	33.9	25.0	4.3	4.7	1.4	0.3	8.8	19.6	45.1	3.0	8.3	36.7	4.2	5.0	84.0	57.2	0.8	3.5	2.7	19,033	14,022	2,435	2,656	772	180	1,525	1,355
21	Rudy Gobert R. Gobert	+2723	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	7,933	894	468	1,452	1,130	1,789
22	Paul George P. George	+2688	701	33.5	20.2	6.4	3.5	1.7	0.4	6.9	15.7	43.6	2.5	6.5	38.4	4.0	4.7	84.8	56.8	0.9	5.5	2.6	23,489	14,175	4,484	2,442	1,199	309	1,844	1,869
23	Manu Ginobili M. Ginobili	+2602	434	27.8	14.7	4.0	3.6	1.5	0.3	4.7	10.3	45.4	1.4	3.6	38.2	3.9	4.8	81.5	59.0	0.9	3.2	2.1	12,056	6,361	1,745	1,547	670	146	911	1,025
24	Dwyane Wade D. Wade	+2496	629	37.0	24.9	5.0	6.1	1.7	1.0	8.8	18.1	48.6	0.5	1.8	29.3	6.7	8.7	76.9	56.7	1.3	3.7	3.5	23,258	15,647	3,174	3,841	1,100	634	2,194	1,570
25	Joel Embiid J. Embiid	+2490	452	31.9	27.7	11.0	3.7	0.9	1.6	9.1	18.2	50.1	1.2	3.5	33.9	8.3	10.0	82.8	61.3	2.2	8.8	3.4	14,409	12,523	4,987	1,658	411	738	1,547	1,369