Phil Niekro has started the most career games by a pitcher 45 or older, with 122 starts.

Interpreted as:

most regular-season starts by a player from age 45

	NAME	GS	G	W	L	W%	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	122	125	50	44	.532	4.27	430	19	2	0	784.2	826	372	420	90	357	15	2	3	3,459	26	4.93	4.09	1.20	1.03	12.4	10.3	1.51	.287	4.82	9.47
2	Jamie Moyer J. Moyer	87	92	39	31	.557	4.54	316	2	1	0	523.2	554	264	280	78	143	29	1	7	2,254	4	5.43	2.46	2.21	1.34	14.0	6.3	1.33	.282	4.81	9.52
3	Charlie Hough C. Hough	55	55	14	25	.359	4.58	191	1	1	0	318.0	320	162	183	37	123	18	0	3	1,391	20	5.41	3.48	1.55	1.05	13.7	8.8	1.39	.277	5.18	9.06
4	Nolan Ryan N. Ryan	40	40	10	14	.417	4.06	203	2	0	0	223.2	192	101	122	14	109	13	0	0	966	12	8.17	4.39	1.86	0.56	21.0	11.3	1.35	.284	4.91	7.73
5	Jack Quinn J. Quinn	40	182	37	31	.544	3.56	147	15	2	31	529.0	596	209	260	16	136	7	97		2,274	12	2.50	2.31	1.08	0.27	6.5	6.0	1.38	.295	4.42	10.14
6	Tommy John T. John	34	36	9	14	.391	4.94	81	0	0	0	196.2	253	108	120	12	58	8	2	6	876	7	3.71	2.65	1.40	0.55	9.2	6.6	1.58	.336	5.49	11.58
7	Randy Johnson R. Johnson	21	26	9	7	.563	4.28	103	1	0	0	124.0	119	59	63	20	37	3	2	3	522	6	7.48	2.69	2.78	1.45	19.7	7.1	1.26	.276	4.57	8.64
8	Bartolo Colon B. Colon	16	18	5	10	.333	7.20	45	1	0	0	90.0	125	72	74	19	20	1	0	1	408	2	4.50	2.00	2.25	1.90	11.0	4.9	1.61	.328	7.40	12.50
9	Satchel Paige S. Paige	14	127	18	23	.439	3.57	191	3	2	27	320.1	298	127	142	23	125	5	85	0	1,359	5	5.37	3.51	1.53	0.65	14.1	9.2	1.32	.271	3.99	8.37
10	Tim Wakefield T. Wakefield	9	10	1	4	.200	5.24	41	1	0	0	55.0	62	32	46	9	17	4	1	0	251	6	6.71	2.78	2.41	1.47	16.3	6.8	1.44	.294	7.53	10.15
11	Roger Clemens R. Clemens	6	6	3	1	.750	4.09	25	0	0	0	33.0	30	15	16	4	13	4	0	0	141	1	6.82	3.55	1.92	1.09	17.7	9.2	1.30	.274	4.36	8.18
12	Ted Lyons T. Lyons	5	5	1	4	.200	2.32	10	5	0	0	42.2	38	11	17	2	9	0	0		174	0	2.11	1.90	1.11	0.42	5.7	5.2	1.10	.235	3.59	8.02
13	Bobo Newsom B. Newsom	4	24	4	2	.667	4.05	28	1	0	1	66.2	59	30	33	4	37	7	10		302	2	3.78	5.00	0.76	0.54	9.3	12.3	1.44	.243	4.45	7.97
14	Hod Lisenbee H. Lisenbee	3	31	1	3	.250	5.49	14	0	0	1	80.1	97	49	56	12	16	2	17		350	1	1.57	1.79	0.88	1.34	4.0	4.6	1.41	.278	6.27	10.87
15	Gaylord Perry G. Perry	2	2	0	1	.000	4.09	9	0	0	0	11.0	18	5	8	0	4	0	0	0	56	0	7.36	3.27	2.25	0.00	16.1	7.1	2.00	.419	6.55	14.73
16	Fred Johnson F. Johnson	2	5	0	1	.000	6.43	2	1	0	0	14.0	23	10	12	0	9	0	2		71	0	1.29	5.79	0.22	0.00	2.8	12.7	2.29	.383	7.71	14.79
17	Red Faber R. Faber	2	5	0	3	.000	1.89	3	0	0	0	19.0	18	4	8	0	9	1	2		87	0	1.42	4.26	0.33	0.00	3.4	10.3	1.42	.243	3.79	8.53