Phil Niekro has won the most career games by a pitcher older than 30, with 264 wins.

Interpreted as:

pitcher with most regular-season wins after age of 30

	NAME	W	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	H/9
1	Phil Niekro P. Niekro	264	234	.530	662	626	3.51	2,806	199	35	9	4516.0	4,281	1,759	2,023	426	1,596	100	23	65	19,074	162	5.59	3.18	1.76	0.85	14.7	8.4	1.30	.273	4.03	8.53
2	Warren Spahn W. Spahn	255	172	.597	526	462	3.10	1,762	258	41	22	3636.0	3,388	1,254	1,387	324	918	33	50		14,896	46	4.36	2.27	1.92	0.80	11.8	6.2	1.18	.258	3.43	8.39
3	Jamie Moyer J. Moyer	223	146	.604	530	502	4.23	1,916	23	7	0	3222.0	3,311	1,513	1,619	432	835	121	6	46	13,651	34	5.35	2.33	2.29	1.21	14.0	6.1	1.29	.278	4.52	9.25
4	Randy Johnson R. Johnson	222	104	.681	430	417	3.12	3,545	65	25	1	2890.0	2,380	1,001	1,130	305	807	130	5	29	11,751	57	11.04	2.51	4.39	0.95	30.2	6.9	1.10	.298	3.52	7.41
5	Gaylord Perry G. Perry	221	182	.548	492	489	3.16	2,327	218	39	1	3700.1	3,449	1,300	1,497	284	957	71	3	89	15,161	99	5.66	2.33	2.43	0.69	15.3	6.3	1.19	.275	3.64	8.39
6	Early Wynn E. Wynn	199	142	.584	442	392	3.35	1,746	177	38	13	2919.0	2,581	1,088	1,210	246	1,157	44	40		12,263	34	5.38	3.57	1.51	0.76	14.2	9.4	1.28	.257	3.73	7.96
7	Dazzy Vance D. Vance	197	136	.592	431	345	3.22	2,027	216	29	12	2934.2	2,773	1,050	1,225	131	819	74	47		12,227	36	6.22	2.51	2.47	0.40	16.6	6.7	1.22	.288	3.76	8.50
8	Roger Clemens R. Clemens	193	105	.648	417	416	3.36	2,678	27	11	0	2752.2	2,369	1,027	1,126	226	990	101	0	25	11,468	94	8.76	3.24	2.71	0.74	23.4	8.6	1.22	.287	3.68	7.75
9	Jack Quinn J. Quinn	191	175	.522	613	351	3.35	1,002	181	25	52	3096.0	3,399		1,431	90	680	72	175			45	2.91	1.98	1.47	0.26		5.5	1.32	.315	4.16	9.88
10	Greg Maddux G. Maddux	189	122	.608	405	405	3.43	1,711	34	14	0	2621.2	2,607	999	1,108	234	408	74	0	82	10,702	29	5.87	1.40	4.19	0.80	16.0	3.8	1.15	.287	3.80	8.95
11	Lefty Grove L. Grove	185	84	.688	344	278	3.11	1,221	194	25	22	2395.2	2,385	827	963	113	670	20	56		10,115	18	4.59	2.52	1.82	0.42	12.1	6.6	1.28	.281	3.62	8.96
12	Nolan Ryan N. Ryan	183	160	.534	476	476	3.29	3,288	84	27	0	3152.0	2,386	1,151	1,311	199	1,411	87	0	46	13,116	174	9.39	4.03	2.33	0.57	25.1	10.8	1.20	.269	3.74	6.81
13	Grover Alexander G. Alexander	183	120	.604	367	323	2.97	801	217	29	17	2694.1	2,765	888	1,063	119	396	15	33		11,005	18	2.68	1.32	2.02	0.40	7.3	3.6	1.17	.274	3.55	9.24
14	Steve Carlton S. Carlton	181	125	.592	394	380	3.32	2,220	109	24	1	2766.1	2,487	1,020	1,170	234	944	25	6	77	11,472	100	7.22	3.07	2.35	0.76	19.4	8.2	1.24	.280	3.81	8.09
15	David Wells D. Wells	180	109	.623	388	387	4.21	1,601	52	12	0	2546.2	2,772	1,191	1,278	306	471	62	0	32	10,695	51	5.66	1.66	3.40	1.08	15.0	4.4	1.27	.299	4.52	9.80
16	Charlie Hough C. Hough	177	178	.499	518	439	3.87	1,927	107	13	2	3185.1	2,831	1,371	1,564	335	1,335	135	33	27	13,554	146	5.44	3.77	1.44	0.95	14.2	9.8	1.31	.254	4.42	8.00
17	Red Faber R. Faber	173	158	.523	468	350	3.45	968	197	18	16	2919.1	3,057		1,357	95	842	58	82		12,458	35	2.98	2.60	1.15	0.29	7.8	6.8	1.34	.282	4.18	9.42
18	Eddie Plank E. Plank	173	99	.636	357	276	1.15	1,168	192	40	23	2338.0	2,013		757	18	585	67	67			44	4.50	2.25	2.00	0.07		6.5	1.11	.276	2.91	7.75
19	Tommy John T. John	171	127	.574	417	394	3.62	1,009	93	19	1	2629.0	2,865	1,058	1,201	161	651	49	13	42	11,092	99	3.45	2.23	1.55	0.55	9.1	5.9	1.34	.293	4.11	9.81
20	Don Sutton D. Sutton	169	130	.565	407	403	3.48	1,661	68	18	2	2738.0	2,522	1,059	1,163	285	690	35	3	43	11,266	47	5.46	2.27	2.41	0.94	14.7	6.1	1.17	.260	3.82	8.29
21	Tom Glavine T. Glavine	166	111	.599	384	384	3.60	1,395	22	12	0	2457.0	2,427	983	1,058	229	836	40	0	84	10,358	18	5.11	3.06	1.67	0.84	13.5	8.1	1.33	.280	3.88	8.89
22	Eppa Rixey E. Rixey	159	126	.558	395	315	3.37	576	158	20	7	2556.0	2,756	956	1,156	70	534	40	64		10,728	33	2.03	1.88	1.08	0.25	5.4	5.0	1.29	.282	4.07	9.70
23	Joe Niekro J. Niekro	157	137	.534	417	353	3.47	1,278	82	20	5	2478.2	2,297	957	1,108	171	922	50	22	32	10,455	151	4.64	3.35	1.39	0.62	12.2	8.8	1.30	.265	4.02	8.34
24	Dolf Luque D. Luque	155	147	.513	438	298	3.28	923	165	19	22	2609.2	2,664		1,164	97	747	18	95		10,971	40	3.18	2.58	1.24	0.33	8.4	6.8	1.31	.279	4.01	9.19
25	Mordecai Brown M. Brown	152	85	.641	329	202	1.27	869	160	31	33	1989.1	1,726		669	28	418	40	117			40	3.93	1.89	2.08	0.13		5.7	1.08	.287	3.03	7.81