Phil Niekro has won the most career games by a pitcher older than 41, with 85 wins.

Interpreted as:

most regular-season wins by a pitcher after age 41

	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	85	65	.567	216	212	3.99	764	28	7	0	1360.0	1,383	603	676	137	591	21	2	9	5,894	38	5.06	3.91	1.29	0.91	13.0	10.0	1.45	.284	4.47	9.15
2	Jamie Moyer J. Moyer	77	64	.546	190	185	4.53	659	6	2	0	1134.1	1,229	571	607	164	312	47	1	17	4,883	12	5.23	2.48	2.11	1.30	13.5	6.4	1.36	.288	4.82	9.75
3	Jack Quinn J. Quinn	77	60	.562	280	114	3.45	291	48	10	34	1103.2	1,254	423	520	34	239	23	108		4,727	15	2.37	1.95	1.22	0.28	6.2	5.1	1.35	.295	4.24	10.23
4	Nolan Ryan N. Ryan	51	39	.567	129	129	3.43	939	15	6	0	840.0	593	320	362	61	353	34	0	5	3,455	48	10.06	3.78	2.66	0.65	27.2	10.2	1.13	.257	3.88	6.35
5	Randy Johnson R. Johnson	44	30	.595	100	95	4.36	529	4	0	0	571.2	542	277	305	81	157	23	2	12	2,396	11	8.33	2.47	3.37	1.28	22.1	6.6	1.22	.287	4.80	8.53
6	Charlie Hough C. Hough	42	59	.416	145	143	4.21	488	14	2	0	912.1	837	427	477	101	402	47	1	7	3,950	39	4.81	3.97	1.21	1.00	12.4	10.2	1.36	.253	4.71	8.26
7	Bartolo Colon B. Colon	37	44	.457	114	107	4.79	388	3	1	0	620.0	718	330	352	99	113	11	2	8	2,648	3	5.63	1.64	3.43	1.44	14.7	4.3	1.34	.304	5.11	10.42
8	Hoyt Wilhelm H. Wilhelm	36	25	.590	328	0	2.04	422	0	0	73	538.0	364	122	149	30	173	13	218	25	2,134	25	7.06	2.89	2.44	0.50	19.8	8.1	1.00	.223	2.49	6.09
9	Warren Spahn W. Spahn	34	35	.493	104	85	3.88	254	32	7	4	606.0	636	261	295	70	150	5	14	10	2,545	12	3.77	2.23	1.69	1.04	10.0	5.9	1.30	.274	4.38	9.45
10	Cy Young C. Young	33	34	.493	74	72	0.02	225	56	6	0	583.2	554		247	10	113	16	1		2,332	19	3.47	1.74	1.99	0.15	9.6	4.8	1.14	.276	3.81	8.54
11	Roger Clemens R. Clemens	32	21	.604	80	79	2.67	426	1	0	0	494.2	398	147	167	30	144	13	0	6	1,999	15	7.75	2.62	2.96	0.55	21.3	7.2	1.10	.266	3.04	7.24
12	Tommy John T. John	31	31	.500	106	97	4.43	203	4	1	0	554.1	671	273	305	43	147	18	5	15	2,417	22	3.30	2.39	1.38	0.70	8.4	6.1	1.48	.313	4.95	10.89
13	Satchel Paige S. Paige	28	31	.475	179	26	3.31	288	7	4	33	476.0	429	175	192	30	180	7	109	0	2,003	6	5.45	3.40	1.60	0.57	14.4	9.0	1.28	.266	3.63	8.11
14	Tim Wakefield T. Wakefield	26	26	.500	94	71	5.06	274	3	0	0	464.1	492	261	294	62	139	27	16	4	2,027	31	5.31	2.69	1.97	1.20	13.5	6.9	1.36	.282	5.70	9.54
15	Gaylord Perry G. Perry	26	37	.413	88	87	4.41	265	12	1	0	567.0	662	278	306	60	130	13	1	9	2,441	23	4.21	2.06	2.04	0.95	10.9	5.3	1.40	.305	4.86	10.51
16	David Wells D. Wells	25	17	.595	66	66	4.66	207	2	0	0	386.0	473	200	210	49	72	10	0	5	1,661	5	4.83	1.68	2.88	1.14	12.5	4.3	1.41	.320	4.90	11.03
17	Red Faber R. Faber	17	30	.362	127	29	3.74	105	7	1	12	404.2	460	168	214	17	132	5	68		1,788	5	2.34	2.94	0.80	0.38	5.9	7.4	1.46	.290	4.76	10.23
18	Rich Hill R. Hill	16	22	.421	62	53	4.89	243	0	0	0	274.1	291	149	167	39	98	12	4	0	1,201	2	7.97	3.22	2.48	1.28	20.2	8.2	1.42	.311	5.48	9.55
19	Dolf Luque D. Luque	16	7	.696	79	1	3.39	47	0	0	13	162.0	173	61	67	11	44	1	52		688	4	2.61	2.44	1.07	0.61	6.8	6.4	1.34	.277	3.72	9.61
20	Don Sutton D. Sutton	14	17	.452	51	50	4.45	143	1	0	0	279.0	290	138	145	45	71	8	0	6	1,175	9	4.61	2.29	2.01	1.45	12.2	6.0	1.29	.270	4.68	9.35
21	Dutch Leonard D. Leonard	14	11	.560	131	1	3.11	93	0	0	22	211.0	197	73	82	15	74	6	91		896	7	3.97	3.16	1.26	0.64	10.4	8.3	1.28	.257	3.50	8.40
22	Kenny Rogers K. Rogers	12	17	.414	41	41	5.36	118	0	0	0	236.2	277	141	154	30	96	10	0	3	1,057	5	4.49	3.65	1.23	1.14	11.2	9.1	1.58	.308	5.86	10.53
23	Jim Kaat J. Kaat	11	9	.550	127	3	3.82	62	0	0	6	162.2	187	69	84	13	50	2	37	20	712	4	3.43	2.77	1.24	0.72	8.7	7.0	1.46	.297	4.65	10.35
24	Connie Marrero C. Marrero	11	12	.478	43	27	3.51	87	11	2	2	205.0	198	80	89	24	68	5	10		866	5	3.82	2.99	1.28	1.05	10.0	7.9	1.30	.255	3.91	8.69
25	Jesse Haines J. Haines	11	9	.550	55	18	3.98	47	6	0	2	210.1	231	93	99	10	54	3	16		896	5	2.01	2.31	0.87	0.43	5.2	6.0	1.35	.283	4.24	9.88