Wayne Gretzky has the highest career plus/minus by a player younger than 30, at +587.

Interpreted as:

highest plus minus before turning 30 years old by a player

	NAME	+/-	GP	G	A	P	PIM	PPG	PPA	SHG	SHA	GWG	OTG	S	S%
1	Wayne Gretzky W. Gretzky	+587	895	706	1,366	2,072	401	154	411	64	65	72	2	3,471	20.3
2	Bobby Orr B. Orr	+580	651	268	643	911	949	76	248	16	31	26	0	3,040	8.8
3	Bryan Trottier B. Trottier	+471	834	417	698	1,115	627	121	204	17	13	62	1	2,008	20.8
4	Larry Robinson L. Robinson	+470	635	106	363	469	414	26	96	2	1	18	0	1,124	9.4
5	Guy Lafleur G. Lafleur	+452	728	432	579	1,011	316	114	191	3	2	84	0	2,544	17.0
6	Steve Shutt S. Shutt	+421	720	357	323	680	336	77	60	0	0	47	0	1,910	18.7
7	Ray Bourque R. Bourque	+389	828	235	636	871	662	84	294	7	13	34	3	3,132	7.5
8	Mike Bossy M. Bossy	+387	730	564	543	1,107	185	178	193	8	1	80	4	2,640	21.4
9	Jari Kurri J. Kurri	+373	754	474	569	1,043	348	107	146	31	35	60	7	2,162	21.9
10	Bobby Clarke B. Clarke	+360	773	270	598	868	909	82	175	26	20	28	0	1,892	14.3
11	Brad McCrimmon B. McCrimmon	+346	745	64	241	305	874	12	48	6	17	14	0	1,156	5.5
12	Guy Lapointe G. Lapointe	+321	572	141	307	448	589	48	121	3	7	17	0	1,804	7.8
13	Denis Potvin D. Potvin	+320	711	222	539	761	925	86	252	8	19	32	0	2,139	10.4
14	Brad Park B. Park	+319	665	145	432	577	979	54	152	5	6	23	0	1,939	7.5
15	Jimmy Watson J. Watson	+295	613	38	148	186	492	3	14	3	3	5	0	794	4.8
16	Bill Barber B. Barber	+292	774	371	398	769	559	96	152	29	19	52	0	2,827	13.1
17	Brian Propp B. Propp	+287	728	347	448	795	618	95	149	20	24	54	0	2,470	14.0
18	Serge Savard S. Savard	+287	529	64	183	247	382	18	42	6	7	8	0	844	7.6
19	Phil Esposito P. Esposito	+277	596	326	409	735	404	94	135	9	6	63	0	2,493	13.1
20	Craig Ramsay C. Ramsay	+268	760	200	324	524	153	17	41	23	16	28	0	1,233	16.2
21	Ken Hodge K. Hodge	+260	640	257	348	605	594	57	67	3	4	44	0	1,637	15.7
22	Charlie Huddy C. Huddy	+254	571	75	242	317	412	22	78	2	8	5	1	1,131	6.6
23	Clark Gillies C. Gillies	+251	763	285	332	617	763	86	101	0	0	39	0	1,925	14.8
24	Rod Langway R. Langway	+246	656	45	218	263	651	9	30	3	3	8	0	992	4.5
25	Andre Dupont A. Dupont	+244	583	46	146	192	1,617	9	36	0	6	8	0	1,110	4.1