most losses for a player over 40 years old

Phil Niekro has lost the most career games by a pitcher older than 40, with 83 games.

Interpreted as:

most regular-season losses for a player over 40 years old

	NAME	L	W	L%	G	W%	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	83	100	.454	256	.546	250	3.93	940	39	10	1	1635.0	1,639	714	795	167	676	24	4	12	7,031	47	5.17	3.72	1.39	0.92	13.4	9.6	1.42	.282	4.38	9.02
2	Jamie Moyer J. Moyer	77	84	.478	224	.522	218	4.63	784	7	2	0	1336.1	1,446	688	734	208	375	58	2	20	5,771	13	5.28	2.53	2.09	1.40	13.6	6.5	1.36	.285	4.94	9.74
3	Jack Quinn J. Quinn	73	89	.451	322	.549	138	3.52	346	60	10	37	1307.0	1,504	511	640	41	285	32	116		5,631	17	2.38	1.96	1.21	0.28	6.1	5.1	1.37	.297	4.41	10.36
4	Charlie Hough C. Hough	72	52	.581	175	.419	173	4.24	582	19	3	0	1094.1	1,005	515	574	129	497	53	1	9	4,745	46	4.79	4.09	1.17	1.06	12.3	10.5	1.37	.251	4.72	8.27
5	Bartolo Colon B. Colon	55	55	.500	145	.500	138	4.58	542	3	1	0	820.2	928	418	446	122	140	14	2	11	3,480	5	5.94	1.54	3.87	1.34	15.6	4.0	1.30	.303	4.89	10.18
6	Nolan Ryan N. Ryan	50	63	.442	162	.558	162	3.45	1,167	19	7	0	1060.0	779	406	460	79	440	41	0	11	4,385	58	9.91	3.74	2.65	0.67	26.6	10.0	1.15	.263	3.91	6.61
7	Gaylord Perry G. Perry	48	35	.578	119	.422	117	4.17	393	18	3	0	759.1	865	352	402	74	191	20	2	12	3,262	30	4.66	2.26	2.06	0.88	12.0	5.9	1.39	.306	4.76	10.25
8	Warren Spahn W. Spahn	48	53	.475	138	.525	119	3.51	378	55	8	4	880.2	877	343	382	94	206	8	14	12	3,640	15	3.86	2.11	1.83	0.96	10.4	5.7	1.23	.265	3.90	8.96
9	Cy Young C. Young	45	54	.455	110	.545	105	0.01	383	86	9	2	882.0	782		315	11	147	18	4		3,465	23	3.91	1.50	2.61	0.11	11.1	4.2	1.05	.265	3.21	7.98
10	Tommy John T. John	44	37	.543	137	.457	122	4.67	245	5	2	0	697.0	870	362	398	58	198	21	7	16	3,071	34	3.16	2.56	1.24	0.75	8.0	6.4	1.53	.319	5.14	11.23
11	Red Faber R. Faber	43	25	.632	155	.368	56	3.85	160	17	1	12	570.2	636	244	311	23	182	10	68		2,510	7	2.52	2.87	0.88	0.36	6.4	7.3	1.43	.287	4.90	10.03
12	Randy Johnson R. Johnson	39	61	.390	134	.610	129	4.15	755	8	0	0	804.1	766	371	413	112	199	35	2	14	3,351	14	8.45	2.23	3.79	1.25	22.5	5.9	1.20	.291	4.62	8.57
13	Tim Wakefield T. Wakefield	37	37	.500	126	.500	103	4.79	402	4	0	0	663.0	668	353	393	88	210	36	16	5	2,856	43	5.46	2.85	1.91	1.19	14.1	7.4	1.32	.274	5.33	9.07
14	Hoyt Wilhelm H. Wilhelm	33	44	.429	391	.571	0	2.05	510	0	0	90	666.0	456	152	185	39	205	14	260	29	2,632	31	6.89	2.77	2.49	0.53	19.4	7.8	0.99	.224	2.50	6.16
15	Rich Hill R. Hill	32	23	.582	96	.418	86	4.52	397	0	0	0	442.0	437	222	244	62	161	28	4	0	1,905	5	8.08	3.28	2.47	1.26	20.8	8.5	1.35	.298	4.97	8.90
16	Satchel Paige S. Paige	31	28	.525	179	.475	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
17	Steve Carlton S. Carlton	29	15	.659	68	.341	54	5.72	216	3	0	1	338.0	381	215	250	54	177	5	6	9	1,539	14	5.75	4.71	1.22	1.44	14.0	11.5	1.65	.301	6.66	10.14
18	Don Sutton D. Sutton	28	29	.491	85	.509	84	4.15	259	4	1	0	486.0	482	224	238	76	120	11	0	8	2,028	13	4.80	2.22	2.16	1.41	12.8	5.9	1.24	.260	4.41	8.93
19	Roger Clemens R. Clemens	26	51	.338	113	.662	112	2.83	619	1	0	0	706.0	575	222	248	50	221	19	0	11	2,870	19	7.89	2.82	2.80	0.64	21.6	7.7	1.13	.268	3.16	7.33
20	R.A. Dickey	25	20	.556	61	.444	60	4.35	262	0	0	0	359.2	362	174	196	54	130	16	1	3	1,543	18	6.56	3.25	2.02	1.35	17.0	8.4	1.37	.285	4.90	9.06
21	Kenny Rogers K. Rogers	25	29	.463	75	.537	74	4.66	217	0	0	0	440.2	472	228	251	53	158	19	1	5	1,906	10	4.43	3.23	1.37	1.08	11.4	8.3	1.43	.287	5.13	9.64
22	David Wells D. Wells	25	37	.403	95	.597	95	4.53	312	2	0	0	562.1	675	283	296	71	88	12	0	5	2,399	7	4.99	1.41	3.55	1.14	13.0	3.7	1.36	.315	4.74	10.80
23	Joe Niekro J. Niekro	24	17	.585	57	.415	53	5.32	150	1	0	0	284.1	310	168	198	32	135	11	2	3	1,284	25	4.75	4.27	1.11	1.01	11.7	10.5	1.57	.291	6.27	9.81
24	Johnny Niggeling J. Niggeling	24	15	.615	53	.385	50	3.23	181	18	3	0	356.2	324	128	157	14	154	6	2		1,526	9	4.57	3.89	1.18	0.35	11.9	10.1	1.34	.265	3.96	8.18
25	Sad Sam Jones S. Sam Jones	24	21	.533	59	.467	56	4.42	130	23	2	0	401.0	455	197	229	29	137	6	3		1,782	9	2.92	3.07	0.95	0.65	7.3	7.7	1.48	.288	5.14	10.21