5 players are tied for the youngest defensemen in a season. They were 17 years old. The first three are Larry Hillman in 1954-55, Len Wharton in 1944-45 and Hy Buller in 1943-44.

Interpreted as:

youngest defense team average age per game in a regular season

	NAME	AGE	AGE/GP	GP	SEASON	TM	G	A	P	+/-	PIM	PPG	PPA	SHG	SHA	GWG	OTG	S	S%	FOW	FO	HIT	BKS	TKA	GVA	TOI/GP
1	Larry Hillman L. Hillman	17	2.83	6	1954-55	DET	0	0	0		2	0	0	0	0	0
2	Len Wharton L. Wharton	17	17	1	1944-45	NYR	0	0	0		0	0	0	0	0	0
3	Hy Buller H. Buller	17	2.43	7	1943-44	DET	0	3	3		4	0	0	0	0	0
4	Ross Johnstone R. Johnstone	17	0.94	18	1943-44	TOR	2	0	2		6	0	0	0	0	0
5	Otto Schmidt O. Schmidt	17	8.5	2	1943-44	BOS	0	0	0		0	0	0	0	0	0
6	Zayne Parekh Z. Parekh	18	18	1	2024-25	CGY	1	0	1	+3	2	0	0	0	0	0	0	2	50.0	0	0	1	1	0	1	20:31
7	Jamie Drysdale J. Drysdale	18	0.75	24	2020-21	ANA	3	5	8	-12	6	0	1	0	0	0	0	28	10.7	0	0	7	23	6	19	19:35
8	Tobias Bjornfot T. Bjornfot	18	6	3	2019-20	LAK	0	0	0	-4	0	0	0	0	0	0	0	0		0	0	0	0	0	0	12:58
9	Ville Heinola V. Heinola	18	2.25	8	2019-20	WPG	1	4	5	+3	4	0	1	0	0	0	0	10	10.0	0	0	3	5	3	15	18:04
10	Rasmus Dahlin R. Dahlin	18	0.22	82	2018-19	BUF	9	35	44	-13	34	5	15	0	0	4	0	177	5.1	0	0	97	66	38	79	21:09
11	Jakob Chychrun J. Chychrun	18	0.26	68	2016-17	ARI	7	13	20	-14	47	1	1	0	0	0	0	86	8.1	0	0	109	99	12	45	16:40
12	Mikhail Sergachev M. Sergachev	18	4.5	4	2016-17	MTL	0	0	0	+1	0	0	0	0	0	0	0	2	0.0	0	0	10	3	1	3	12:08
13	Oliver Kylington O. Kylington	18	18	1	2015-16	CGY	0	0	0	0	0	0	0	0	0	0	0	1	0.0	0	0	0	1	0	0	17:22
14	Aaron Ekblad A. Ekblad	18	0.22	81	2014-15	FLA	12	27	39	+12	32	6	7	0	0	4	0	170	7.1	0	0	109	80	26	41	21:49
15	Nikita Zadorov N. Zadorov	18	2.57	7	2013-14	BUF	1	0	1	-4	4	0	0	0	0	0	0	4	25.0	0	0	25	3	1	5	17:10
16	Zach Bogosian Z. Bogosian	18	0.38	47	2008-09	ATL	9	10	19	+11	47	2	3	1	0	1	0	90	10.0	0	0	67	50	32	21	18:06
17	Lukas Krajicek L. Krajicek	18	3.6	5	2001-02	FLA	0	0	0	0	0	0	0	0	0	0	0	3	0.0	0	0	4	2	1	0	13:23
18	Rostislav Klesla R. Klesla	18	2.25	8	2000-01	CBJ	2	0	2	-1	6	0	0	0	0	0	0	10	20.0	0	0	7	9	2	8	18:25
19	Steve McCarthy S. McCarthy	18	3.6	5	1999-00	CHI	1	1	2	0	4	1	1	0	0	0	0	4	25.0	0	0	4	2	1	2	15:09
20	Jonathan Girard J. Girard	18	6	3	1998-99	BOS	0	0	0	+1	0	0	0	0	0	0	0	3	0.0
21	Aki Berg A. Berg	18	0.35	51	1995-96	LAK	0	7	7	-13	29	0	0	0	0	0	0	56	0.0
22	Jay McKee J. McKee	18	18	1	1995-96	BUF	0	1	1	+1	2	0	0	0	0	0	0	2	0.0
23	Kyle McLaren K. McLaren	18	0.24	74	1995-96	BOS	5	12	17	+16	73	0	0	0	1	0	0	74	6.8
24	Oleg Tverdovsky O. Tverdovsky	18	0.5	36	1994-95	ANA	3	9	12	-6	14	1	2	1	0	0	0	26	11.5
25	Vlastimil Kroupa V. Kroupa	18	0.67	27	1993-94	SJS	1	3	4	-6	20	0	0	0	0	0	0	16	6.3