who is the youngest player to ever start in a playoff game

Julio Urías is the youngest in a start in a postseason game. He was 20 years and 68 days old in Game 4 of the 2016 NLCS against the Cubs.

	NAME	AGE	GS	DATE	TM		OPP	DEC	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP
1	Julio Urías J. Urías	20-068	1	10/19/2016	LAD	vs	CHC	L	9.82	4	0	0	0	3.2	4	4	4	1	2	0	0	0	18	0
2	Bret Saberhagen B. Saberhagen	20-175	1	10/3/1984	KCR	vs	DET		2.25	5	0	0	0	8.0	6	2	3	1	1	0	0	0	32	0
3	Bullet Joe Bush B. Joe Bush	20-316	1	10/9/1913	PHA	@	NYG	W	1.00	3	1	0	0	9.0	5	1	2	0	4	1	0	0	34	0
4	Fernando Valenzuela F. Valenzuela	20-339	1	10/6/1981	LAD	@	HOU		1.13	6	0	0	0	8.0	6	1	1	0	2	0	0	1	31	0
5	Fernando Valenzuela F. Valenzuela	20-343	1	10/10/1981	LAD	vs	HOU	W	1.00	4	1	0	0	9.0	4	1	1	0	1	0	0	0	31	0
6	Fernando Valenzuela F. Valenzuela	20-347	1	10/14/1981	LAD	vs	MON	L	4.50	4	0	0	0	6.0	7	3	3	0	2	0	0	0	25	1
7	Fernando Valenzuela F. Valenzuela	20-352	1	10/19/1981	LAD	@	MON	W	1.04	6	0	0	0	8.2	3	1	1	0	3	0	0	1	32	0
8	Fernando Valenzuela F. Valenzuela	20-356	1	10/23/1981	LAD	vs	NYY	W	4.00	6	1	0	0	9.0	9	4	4	2	7	0	0	2	40	0
9	Jim Palmer J. Palmer	20-356	1	10/6/1966	BAL	@	LAD	W	0.00	6	1	1	0	9.0	4	0	0	0	3	0	0	1	34	1
10	Johnny Podres J. Podres	21-004	1	10/4/1953	BKN	vs	NYY	L	3.38	0	0	0	0	2.2	1	1	5	1	2	1	0	0	13	0
11	Madison Bumgarner M. Bumgarner	21-071	1	10/11/2010	SFG	@	ATL	W	3.00	5	0	0	0	6.0	6	2	2	1	1	0	0	0	26	0
12	Rick Ankiel R. Ankiel	21-076	1	10/3/2000	STL	vs	ATL		13.50	3	0	0	0	2.2	4	4	4	0	6	0	0	0	16	5
13	Madison Bumgarner M. Bumgarner	21-080	1	10/20/2010	SFG	vs	PHI		5.79	6	0	0	0	4.2	6	3	3	0	1	1	0	0	20	0
14	CC Sabathia	21-084	1	10/13/2001	CLE	vs	SEA	W	3.00	5	0	0	0	6.0	6	2	2	0	5	0	0	1	28	0
15	Rick Ankiel R. Ankiel	21-085	1	10/12/2000	STL	vs	NYM		27.00	1	0	0	0	0.2	1	2	2	0	3	0	0	0	6	2
16	Madison Bumgarner M. Bumgarner	21-091	1	10/31/2010	SFG	@	TEX	W	0.00	6	0	0	0	8.0	3	0	0	0	2	0	0	0	27	0
17	Kerry Wood K. Wood	21-109	1	10/3/1998	CHC	vs	ATL	L	1.80	5	0	0	0	5.0	3	1	1	0	4	0	0	1	22	0
18	Deivi García D. García	21-140	1	10/6/2020	NYY	@	TBR		9.00	0	0	0	0	1.0	1	1	1	1	0	1	0	0	5	0
19	Chief Bender C. Bender	21-158	1	10/10/1905	PHA	@	NYG	W	0.00	9	1	1	0	9.0	4	0	0	0	3	0	0	0	34	0
20	Chief Bender C. Bender	21-162	1	10/14/1905	PHA	@	NYG	L	2.25	4	1	0	0	8.0	5	2	2	0	3	0	0	0	30	0
21	Steve Avery S. Avery	21-179	1	10/10/1991	ATL	@	PIT	W	0.00	9	0	0	0	8.1	6	0	0	0	2	0	0	0	32	0
22	Bret Saberhagen B. Saberhagen	21-183	1	10/11/1985	KCR	vs	TOR		10.38	4	0	0	0	4.1	9	5	5	2	1	0	0	0	21	0
23	Steve Avery S. Avery	21-185	1	10/16/1991	ATL	@	PIT	W	0.00	8	0	0	0	8.0	3	0	0	0	2	0	0	0	26	0
24	Bret Saberhagen B. Saberhagen	21-188	1	10/16/1985	KCR	@	TOR		0.00	2	0	0	0	3.0	3	0	0	0	1	1	0	0	14	0
25	Steve Avery S. Avery	21-191	1	10/22/1991	ATL	vs	MIN		2.57	5	0	0	0	7.0	4	2	3	1	0	0	0	0	26	0