Rich Hill was the oldest starting pitcher in 2023. He was 43 years old.

	NAME	AGE	SEASON	TM	G	W	L	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	Rich Hill R. Hill	43	2023	TOT	27	7	14	.333	27	5.57	120	0	0	0	135.2	155	84	91	23	53	6	0	0	613	2	7.96	3.52	2.26	1.53	19.6	8.6	1.53	.321	6.04	10.28
2	Adam Wainwright A. Wainwright	41	2023	STL	21	5	11	.313	21	7.40	55	0	0	0	101.0	151	83	89	20	41	1	0	0	484	1	4.90	3.65	1.34	1.78	11.4	8.5	1.90	.357	7.93	13.46
3	Justin Verlander J. Verlander	40	2023	TOT	27	13	8	.619	27	3.22	144	0	0	0	162.1	139	58	63	18	45	5	0	0	669	5	7.98	2.49	3.20	1.00	21.5	6.7	1.13	.265	3.49	7.71
4	Jesse Chavez J. Chavez	39	2023	ATL	1	0	0		1	0.00	3	0	0	0	2.1	1	0	0	0	1	1	0	0	9	0	11.57	3.86	3.00	0.00	33.3	11.1	0.86	.250	0.00	3.86
5	Charlie Morton C. Morton	39	2023	ATL	30	14	12	.538	30	3.64	183	0	0	0	163.1	150	66	70	14	83	12	0	2	716	4	10.08	4.57	2.20	0.77	25.6	11.6	1.43	.321	3.86	8.27
6	Zack Greinke Z. Greinke	39	2023	KCR	27	2	13	.133	27	5.02	88	0	0	0	131.0	145	73	75	23	21	3	0	0	543	2	6.05	1.44	4.19	1.58	16.2	3.9	1.27	.299	5.15	9.96
7	Max Scherzer M. Scherzer	38	2023	TOT	27	12	6	.667	27	3.77	174	0	0	0	152.2	126	64	65	28	45	4	0	0	621	2	10.26	2.65	3.87	1.65	28.0	7.2	1.12	.265	3.83	7.43
8	Johnny Cueto J. Cueto	37	2023	MIA	10	1	4	.200	10	6.41	38	0	0	0	46.1	47	33	34	15	14	3	0	0	195	0	7.38	2.72	2.71	2.91	19.5	7.2	1.32	.256	6.60	9.13
9	Corey Kluber C. Kluber	37	2023	BOS	9	2	6	.250	9	6.26	34	0	0	0	41.2	46	29	33	11	18	3	0	0	192	1	7.34	3.89	1.89	2.38	17.7	9.4	1.54	.278	7.13	9.94
10	Hyun Jin Ryu H. Jin Ryu	36	2023	TOR	11	3	3	.500	11	3.46	38	0	0	0	52.0	53	20	25	9	14	1	0	0	224	1	6.58	2.42	2.71	1.56	17.0	6.3	1.29	.272	4.33	9.17
11	Collin McHugh C. McHugh	36	2023	ATL	1	0	0		1	0.00	2	0	0	0	1.2	6	0	3	0	2	0	0	0	13	0	10.80	10.80	1.00	0.00	15.4	15.4	4.80	.667	16.20	32.40
12	Tommy Milone T. Milone	36	2023	SEA	2	0	1	.000	2	2.00	3	0	0	0	9.0	7	2	3	1	6	0	0	0	40	0	3.00	6.00	0.50	1.00	7.5	15.0	1.44	.200	3.00	7.00
13	Yu Darvish Y. Darvish	36	2023	SDP	24	8	10	.444	24	4.56	141	0	0	0	136.1	134	69	71	18	43	8	0	0	574	1	9.31	2.84	3.28	1.19	24.6	7.5	1.30	.319	4.69	8.85
14	Wade Miley W. Miley	36	2023	MIL	23	9	4	.692	23	3.14	79	0	0	0	120.1	99	42	44	16	38	3	0	0	490	2	5.91	2.84	2.08	1.20	16.1	7.8	1.14	.234	3.29	7.40
15	Carlos Carrasco C. Carrasco	36	2023	NYM	20	3	8	.273	20	6.80	66	0	0	0	90.0	115	68	71	18	38	6	0	0	417	3	6.60	3.80	1.74	1.80	15.8	9.1	1.70	.336	7.10	11.50
16	Lance Lynn L. Lynn	36	2023	TOT	32	13	11	.542	32	5.73	191	0	0	0	183.2	189	117	127	44	67	9	0	1	808	3	9.36	3.28	2.85	2.16	23.6	8.3	1.39	.292	6.22	9.26
17	Dallas Keuchel D. Keuchel	35	2023	MIN	6	1	1	.500	6	6.39	14	0	0	0	25.1	29	18	18	2	10	1	0	0	113	1	4.97	3.55	1.40	0.71	12.4	8.8	1.54	.314	6.39	10.30
18	Chase Anderson C. Anderson	35	2023	COL	17	1	6	.143	17	5.75	62	0	0	0	81.1	88	52	53	17	32	7	0	0	354	1	6.86	3.54	1.94	1.88	17.5	9.0	1.48	.301	5.86	9.74
19	Kenta Maeda K. Maeda	35	2023	MIN	20	6	7	.462	20	4.28	112	0	0	0	101.0	93	48	49	16	26	3	0	0	415	2	9.98	2.32	4.31	1.43	27.0	6.3	1.18	.298	4.37	8.29
20	Alex Cobb A. Cobb	35	2023	SFG	28	6	7	.462	28	3.87	131	2	1	0	151.1	163	65	69	19	37	6	0	0	646	7	7.79	2.20	3.54	1.13	20.3	5.7	1.32	.318	4.10	9.69
21	Clayton Kershaw C. Kershaw	35	2023	LAD	24	13	5	.722	24	2.46	137	0	0	0	131.2	100	36	39	19	40	3	0	0	523	6	9.36	2.73	3.43	1.30	26.2	7.6	1.06	.250	2.67	6.84
22	Jacob deGrom J. deGrom	35	2023	TEX	6	2	0	1.000	6	2.67	45	0	0	0	30.1	19	9	11	2	4	0	0	0	115	1	13.35	1.19	11.25	0.59	39.1	3.5	0.76	.266	3.26	5.64
23	Kyle Gibson K. Gibson	35	2023	BAL	33	14	9	.609	33	4.73	157	0	0	0	192.0	198	101	101	23	55	6	0	0	807	8	7.36	2.58	2.85	1.08	19.5	6.8	1.32	.309	4.73	9.28
24	Zach Neal Z. Neal	34	2023	OAK	2	1	0	1.000	2	4.50	8	0	0	0	10.0	8	5	7	3	5	1	0	0	43	0	7.20	4.50	1.60	2.70	18.6	11.6	1.30	.192	6.30	7.20
25	Jose Quintana J. Quintana	34	2023	NYM	13	3	6	.333	13	3.57	60	0	0	0	75.2	75	30	33	5	24	1	0	0	319	2	7.14	2.85	2.50	0.59	18.8	7.5	1.31	.306	3.93	8.92