Willie Crawford is the youngest with more than 0 championships in a season. He was 18 years old in his rookie season in 1965.

Interpreted as:

youngest player to win MLB era title in a regular season

	NAME	AGE	ERA	CHAMPS	SEASON	TM	G	W	L	W%	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Willie Crawford W. Crawford	18		1	1965	LAD
2	Adalberto Mondesi A. Mondesi	19		1	2015	KCR
3	Claudell Washington C. Washington	19		1	1974	OAK
4	Mickey Mantle M. Mantle	19		1	1951	NYY
5	Evan Carter E. Carter	20		1	2023	TEX
6	Juan Soto J. Soto	20		1	2019	WSH
7	Xander Bogaerts X. Bogaerts	20		1	2013	BOS
8	Madison Bumgarner M. Bumgarner	20	3.00	1	2010	SFG	18	7	6	.538	18	86	0	0	0	111.0	119	37	40	11	26	5	0	2	472	1	6.97	2.11	3.31	0.89	18.2	5.5	1.31	.314	3.24	78	3.65	94	9.65	2.7
9	Miguel Cabrera M. Cabrera	20		1	2003	FLA
10	Francisco Rodriguez F. Rodriguez	20	0.00	1	2002	ANA	5	0	0		0	13	0	0	0	5.2	3	0	0	0	2	1	4	1	21	0	20.65	3.18	6.50	0.00	61.9	9.5	0.88	.600	0.00	0	-0.05	-1	4.76	2.8
11	Fernando Valenzuela F. Valenzuela	20	2.48	1	1981	LAD	25	13	7	.650	25	180	11	8	0	192.1	140	53	55	11	61	1	0	4	758	4	8.42	2.85	2.95	0.51	23.7	8.0	1.05	.255	2.57	73	2.44	72	6.55	20.4
12	Manny Sarmiento M. Sarmiento	20	2.06	1	1976	CIN	22	5	1	.833	0	20	0	0	0	43.2	36	10	14	1	12	1	6	3	177	1	4.12	2.47	1.67	0.21	11.3	6.8	1.10	.245	2.89	58	2.90	83	7.42	2.8
13	Milt May M. May	20		1	1971	PIT
14	Jim Palmer J. Palmer	20	3.46	1	1966	BAL	30	15	10	.600	30	147	6	0	0	208.1	176	80	83	21	91	0	0	1	867	7	6.35	3.93	1.62	0.91	17.0	10.5	1.28	.255	3.59	102	3.76	107	7.60	-5.8
15	Ron Fairly R. Fairly	20		1	1959	LAD
16	Juan Pizarro J. Pizarro	20	4.62	1	1957	MIL	24	5	6	.455	10	68	3	0	0	99.1	99	51	58	16	51	1	7	2	440	2	6.16	4.62	1.33	1.45	15.5	11.6	1.51	.273	5.26	130	4.75	135	8.97	-15.3
17	Mickey Mantle M. Mantle	20		1	1952	NYY
18	Joe Garagiola J. Garagiola	20		1	1946	SLN
19	Babe Ruth B. Ruth	20	2.44	1	1915	BSA	32	18	8	.692	28	112	16	1	0	217.2	166	59	80	3	85	6	3		874	9	4.63	3.51	1.32	0.12	12.8	9.7	1.15	.244	3.31	85	2.81	97	6.86	1.8
20	Bullet Joe Bush B. Joe Bush	20	3.82	1	1913	PHA	39	15	6	.714	16	81	6	1	3	200.1	199	85	95	3	66	5	20		834	5	3.64	2.97	1.23	0.13	9.7	7.9	1.32	.289	4.27	134	3.00	103	8.94	-2.9
21	Stuffy McInnis S. McInnis	20		1	1911	PHA
22	Heinie Zimmerman H. Zimmerman	20		1	1907	CHC
23	Brusdar Graterol B. Graterol	21	3.09	1	2020	LAD	23	1	2	.333	2	13	0	0	0	23.1	18	8	9	1	3	3	1	0	88	0	5.01	1.16	4.33	0.39	14.8	3.4	0.90	.250	3.47	71	3.40	76	6.94	2.7
24	Rafael Devers R. Devers	21		1	2018	BOS
25	Dontrelle Willis D. Willis	21	3.30	1	2003	FLA	27	14	6	.700	27	142	2	2	0	160.2	148	59	61	13	58	3	0	0	668	7	7.95	3.25	2.45	0.73	21.3	8.7	1.28	.299	3.42	80	3.45	82	8.29	13.7