Phil Housley has the most career games by a defenseman younger than 29, with 823 games.

Interpreted as:

most regular-season games by a defenseman under age 29

	NAME	GP	G	A	P	+/-	PIM	PPG	PPA	SHG	SHA	GWG	OTG	S	S%	FOW	FO	FOW%	HIT	BKS	TKA	GVA	TOI/GP
1	Phil Housley P. Housley	823	238	556	794	-34	544	88	299	5	3	34	3	2,242	10.6
2	Scott Stevens S. Stevens	821	130	458	588	+151	2,000	61	178	2	6	18	1	1,748	7.4
3	Drew Doughty D. Doughty	799	104	334	438	+84	569	49	141	2	5	24	4	1,725	6.0	1	3	33.3	1,404	1,026	199	802	26:17
4	Roman Hamrlik R. Hamrlik	792	110	302	412	-103	917	51	161	4	11	15	3	2,026	5.4	1	2	50.0	424	415	142	230	25:38
5	Luke Richardson L. Richardson	782	26	104	130	-128	1,289	3	12	3	9	1	0	741	3.5
6	Noah Hanifin N. Hanifin	774	73	256	329	-1	203	15	68	1	5	12	2	1,446	5.0	0	0		655	899	436	660	20:39
7	Larry Murphy L. Murphy	773	151	470	621	+44	631	60	221	3	11	15	1	1,730	8.7
8	Doug Bodger D. Bodger	762	89	360	449	+9	780	55	205	1	11	8	1	1,646	5.4
9	Ray Bourque R. Bourque	755	216	583	799	+359	610	77	264	7	13	32	3	2,843	7.6
10	Al Iafrate A. Iafrate	740	144	295	439	-61	1,182	41	116	8	8	22	0	1,590	9.1
11	Marc-Edouard Vlasic M. Vlasic	737	47	179	226	+125	313	9	47	1	6	7	1	962	4.9	0	0		429	1,235	168	379	22:06
12	Paul Coffey P. Coffey	733	283	669	952	+239	1,076	96	285	17	27	25	1	2,483	11.4
13	Kevin Hatcher K. Hatcher	732	159	296	455	-13	1,065	53	135	5	13	26	0	2,001	7.9
14	Dave Babych D. Babych	731	117	438	555	-185	642	71	237	1	7	16	0	2,127	5.5
15	Seth Jones S. Jones	730	82	292	374	-100	252	19	103	1	7	15	10	1,604	5.1	0	0		841	1,186	378	557	23:32
16	Scott Niedermayer S. Niedermayer	730	87	296	383	+129	372	39	116	1	5	20	5	1,321	6.6	4	14	28.6	230	209	223	203	24:02
17	Victor Hedman V. Hedman	726	101	345	446	+89	546	18	128	0	11	15	5	1,446	7.0	1	3	33.3	790	1,120	359	563	22:55
18	Aaron Ekblad A. Ekblad	724	118	255	373	+91	495	41	79	2	6	26	7	1,781	6.6	0	0		824	791	315	668	22:52
19	Oliver Ekman-Larsson O. Ekman-Larsson	723	125	239	364	-92	450	53	94	4	2	31	7	1,647	7.6	0	2	0.0	1,272	668	248	406	23:35
20	Ivan Provorov I. Provorov	722	80	210	290	-24	255	11	47	1	7	11	4	1,328	6.0	0	1	0.0	801	1,357	199	760	23:50
21	Glen Wesley G. Wesley	722	93	286	379	+25	603	43	169	7	6	10	0	1,743	5.3
22	Nick Leddy N. Leddy	720	63	242	305	-27	137	18	86	0	1	7	2	1,038	6.1	0	0		650	758	225	423	20:28
23	Jay Bouwmeester J. Bouwmeester	717	65	220	285	-54	447	22	88	0	4	7	0	1,280	5.1	0	1	0.0	814	938	201	462	25:18
24	Luke Schenn L. Schenn	715	30	113	143	-50	529	2	1	0	3	2	0	873	3.4	1	2	50.0	2,302	1,175	195	492	18:22
25	Bryan McCabe B. McCabe	708	76	194	270	+37	1,262	31	84	4	5	11	3	1,220	6.2	1	5	20.0	904	486	45	377	24:13