Jim Turner has won the most games by a rookie older than 30, with 20 wins in 1937.

Interpreted as:

most regular-season wins after age 30, rookie pitcher

	NAME	W	AGE	SEASON	TM	L	W%	G	GS	ERA	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	Jim Turner J. Turner	20	33	1937	BSN	11	.645	33	30	2.38	69	24	5	1	256.2	228	68	80	13	52	0	3		1,031	0	2.42	1.82	1.33	0.46	6.7	5.0	1.09	.240	2.81	66	3.77	101	7.99	-3.1
2	Dick Newsome D. Newsome	19	31	1941	BSA	10	.655	36	29	4.13	58	17	2	0	213.2	235	98	115	13	79	7	4		944	6	2.44	3.33	0.73	0.55	6.1	8.4	1.47	.282	4.84	97	4.12	99	9.90	1.6
3	Ray Kremer R. Kremer	18	31	1924	PIT	10	.643	41	30	3.19	64	17	4	1	259.1	262	92	102	7	51	4	7		1,066	1	2.22	1.77	1.25	0.24	6.0	4.8	1.21	.271	3.54	81	3.53	88	9.09	14.5
4	Dazzy Vance D. Vance	18	31	1922	BKN	12	.600	36	31	3.70	134	17	5	0	245.2	259	101	122	9	94	8	3		1,069	5	4.91	3.44	1.43	0.33	12.5	8.8	1.44	.303	4.47	90	3.64	90	9.49	10.8
5	Sam Kimber S. Kimber	18	31	1884	BKN	20	.474	41	41	3.81	122	41	4	0	361.1	364	153	240	6	72	15	0		1,562	52	3.04	1.79	1.69	0.15	7.8	4.6	1.21	.266	5.98	118	3.54	110	9.07	-13.3
6	Bob Spade B. Spade	17	31	1908	CIN	12	.586	35	28	2.74	74	22	2	1	249.1	230	76	111	2	85	5	7		1,009	1	2.67	3.07	0.87	0.07	7.3	8.4	1.26	.270	4.01	115	2.69	106	8.30	-3.5
7	Johnny Couch J. Couch	16	31	1922	CIN	9	.640	43	33	3.89	45	18	2	1	264.0	301	114	132	13	56	5	5		1,128	2	1.53	1.91	0.80	0.44	4.0	5.0	1.35	.285	4.50	100	4.00	104	10.26	-6.5
8	Hugh Daily H. Daily	15	34	1882	BUF	14	.517	29	29	2.99	116	29	0	0	255.2	246	85	165	7	70		0		1,120	11	4.08	2.46	1.66	0.25	10.4	6.3	1.24		5.81	102	3.03	106	8.66	-3.6
9	Sig Jakucki S. Jakucki	13	34	1944	SLA	9	.591	35	24	3.55	67	12	4	3	198.0	211	78	89	17	54	3	8		853	1	3.05	2.45	1.24	0.77	7.9	6.3	1.34	.272	4.05	100	3.84	109	9.59	-6.4
10	Art Fowler A. Fowler	12	31	1954	CIN	10	.545	40	29	3.83	93	8	1	0	227.2	256	97	112	20	85	4	9		998	3	3.68	3.36	1.09	0.79	9.3	8.5	1.50	.296	4.43	91	3.90	93	10.12	7.2
11	Roger Wolff R. Wolff	12	31	1942	PHA	15	.444	32	25	3.32	94	15	2	2	214.1	206	79	99	16	69	3	7		912	5	3.95	2.90	1.36	0.67	10.3	7.6	1.28	.260	4.16	90	3.52	99	8.65	1.1
12	Billy Campbell B. Campbell	12	34	1908	CIN	13	.480	35	24	2.60	73	19	2	2	221.1	203	64	99	3	44	10	10		859	3	2.97	1.79	1.66	0.12	8.5	5.1	1.12	.274	4.03	109	2.35	92	8.25	5.2
13	Tot Pressnell T. Pressnell	11	31	1938	BKN	14	.440	43	19	3.56	57	6	1	4	192.0	209	76	86	11	56	8	19		836	5	2.67	2.63	1.02	0.52	6.8	6.7	1.38	.281	4.03	91	4.08	100	9.80	0.8
14	Ed Holley E. Holley	11	32	1932	PHN	14	.440	34	30	3.95	87	16	2	0	228.0	247	100	114	15	55	6	2		975	0	3.43	2.17	1.58	0.59	8.9	5.6	1.32	.286	4.50	91	3.91	88	9.75	14.5
15	Tomoyuki Sugano T. Sugano	10	35	2025	BAL	10	.500	30	30	4.64	106	0	0	0	157.0	173	81	85	33	36	8	0	2	675	3	6.08	2.06	2.94	1.89	15.7	5.3	1.33	.285	4.87	116	5.35	131	9.92	-22.6
16	Hisanori Takahashi H. Takahashi	10	35	2010	NYM	6	.625	53	12	3.61	114	0	0	8	122.0	116	49	51	13	43	0	21	7	516	1	8.41	3.17	2.65	0.96	22.1	8.3	1.30	.298	3.76	93	3.65	93	8.56	3.6
17	Pete Walker P. Walker	10	33	2002	TOT	5	.667	38	20	4.36	80	0	0	1	140.1	145	68	73	18	51	3	4	5	599	2	5.13	3.27	1.57	1.15	13.4	8.5	1.40	.284	4.68	95	4.64	104	9.30	-2.8
18	Joe Berry J. Berry	10	39	1944	PHA	8	.556	53	0	1.94	44	0	0	12	111.1	78	24	32	4	23	2	47		445	1	3.56	1.86	1.91	0.32	9.9	5.2	0.91	.199	2.59	56	2.89	84	6.31	7
19	Lou Tost L. Tost	10	31	1942	BSN	10	.500	35	22	3.53	43	5	1	0	147.2	146	58	66	12	52	4	5		633	3	2.62	3.17	0.83	0.73	6.8	8.2	1.34	.257	4.02	109	4.03	119	8.90	-11.1
20	Grady Adkins G. Adkins	10	31	1928	CWS	16	.385	36	27	3.73	54	14	0	1	224.2	235	93	113	12	89	6	6		968	1	2.16	3.57	0.61	0.48	5.6	9.2	1.44	.276	4.53	94	4.39	114	9.41	-14.5
21	Junior Guerra J. Guerra	9	31	2016	MIL	3	.750	20	20	2.81	100	0	0	0	121.2	94	38	40	10	43	3	0	2	492	7	7.40	3.18	2.33	0.74	20.3	8.7	1.13	.250	2.96	67	3.70	88	6.95	6.8
22	Hisashi Iwakuma H. Iwakuma	9	31	2012	SEA	5	.643	30	16	3.16	101	0	0	2	125.1	117	44	49	17	43	3	6	3	519	5	7.25	3.09	2.35	1.22	19.5	8.3	1.28	.282	3.52	82	4.34	108	8.40	-5
23	Hiroki Kuroda H. Kuroda	9	33	2008	LAD	10	.474	31	31	3.73	116	2	2	0	183.1	181	76	85	13	42	7	0	8	776	5	5.69	2.06	2.76	0.64	14.9	5.4	1.22	.281	4.17	89	3.58	84	8.89	14.1
24	Dave Hoskins D. Hoskins	9	35	1953	CLE	3	.750	26	7	3.99	55	3	0	1	112.2	102	50	57	9	38	4	9		467	0	4.39	3.04	1.45	0.72	11.8	8.1	1.24	.258	4.55	104	3.77	98	8.15	0.9
25	Tomas de la Cruz T. de la Cruz	9	32	1944	CIN	9	.500	34	20	3.25	65	9	0	1	191.1	170	69	73	9	45	1	10		770	0	3.06	2.12	1.44	0.42	8.4	5.8	1.12	.248	3.43	92	3.19	90	8.00	7.4