Dennis Eckersley and Dennis Martinez were tied for the oldest in 1998. They were 43 years old.

	NAME	AGE	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Dennis Eckersley D. Eckersley	43	1998	BOS
2	Dennis Martinez D. Martinez	43	1998	ATL	51	11	0	1	1	0	0	3	1	0	7	0	0	13	2	1	1	0	0	1	.091	.167	.182	.348	0	-1.8	.164	-12	-1.8
3	Danny Darwin D. Darwin	42	1998	SFG	32	45	2	4	1	0	0	1	1	1	30	0	0	51	5	1	4	0	0	0	.089	.128	.111	.239	-3	-9.2	.115	-41	-9.1
4	Doug Jones D. Jones	41	1998	TOT	41	2	0	0	0	0	0	0	0	0	2	0	0	2	0	0	0	0	0	0	.000	.000	.000	.000	0	-0.6	.000	-121	-0.6
5	Paul Molitor P. Molitor	41	1998	MIN	126	502	75	141	29	5	4	69	45	1	41	9	2	559	192	38	1	10	5	19	.281	.335	.382	.718	62	-7.7	.315	82	-13
6	Jesse Orosco J. Orosco	41	1998	BAL
7	Wade Boggs W. Boggs	40	1998	TBD	123	435	51	122	23	4	7	52	46	0	54	3	2	483	174	34	0	2	6	13	.280	.348	.400	.748	59	-1	.329	93	-4.5
8	Tom Candiotti T. Candiotti	40	1998	OAK	1	1	0	1	1	0	0	0	0	0	0	0	0	2	2	1	1	0	0	0	1.000	1.000	2.000	3.000	2	1.5	1.257	693	1.5
9	Tony Fossas T. Fossas	40	1998	TOT
10	Dave Stieb D. Stieb	40	1998	TOR	1	1	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	.000	.000	.000	.000	0	-0.3	.000	-118	-0.3
11	Harold Baines H. Baines	39	1998	BAL	104	293	40	88	17	0	9	57	32	1	40	0	0	328	132	26	0	2	4	17	.300	.369	.451	.819	48	7.2	.357	115	6.4
12	Jim Eisenreich J. Eisenreich	39	1998	TOT	105	191	21	41	3	2	1	13	16	0	36	6	0	208	51	6	1	0	2	3	.215	.275	.267	.542	11	-14.9	.246	47	-13.9
13	Gary Gaetti G. Gaetti	39	1998	TOT	128	434	60	122	34	1	19	70	43	10	62	1	1	492	215	54	1	4	2	12	.281	.356	.495	.852	76	15.3	.368	123	14.2
14	Rickey Henderson R. Henderson	39	1998	OAK	152	542	101	128	16	1	14	57	118	5	114	66	13	670	188	31	2	3	0	5	.236	.376	.347	.723	86	2.8	.336	100	-0.3
15	Orel Hershiser O. Hershiser	39	1998	SFG	34	66	7	10	2	0	0	1	3	1	16	1	0	78	12	2	8	0	0	0	.152	.200	.182	.382	0	-9.9	.180	2	-9.7
16	Willie McGee W. McGee	39	1998	STL	120	269	27	68	10	1	3	34	14	0	49	7	2	286	89	14	0	3	5	6	.253	.287	.331	.618	20	-15.3	.267	56	-15.8
17	Otis Nixon O. Nixon	39	1998	MIN	110	448	71	133	6	6	1	20	44	2	56	37	7	500	154	13	4	2	0	14	.297	.361	.344	.705	58	-4	.322	87	-8.7
18	Bob Patterson B. Patterson	39	1998	CHC	30	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	1	0	0	0
19	Tony Phillips T. Phillips	39	1998	TOT	65	236	34	59	16	0	4	21	47	2	50	1	1	289	87	20	1	3	1	3	.250	.375	.369	.744	38	2	.339	106	2.2
20	Joe Carter J. Carter	38	1998	TOT	126	388	51	101	22	1	18	63	24	2	61	4	1	418	179	41	0	4	4	9	.260	.304	.461	.765	50	-1.9	.326	96	-2.3
21	Chili Davis C. Davis	38	1998	NYY	35	103	11	30	7	0	3	9	14	0	18	0	1	118	46	10	0	1	1	6	.291	.373	.447	.819	17	2.8	.359	115	2.4
22	Tony Gwynn T. Gwynn	38	1998	SDP	127	461	65	148	35	0	16	69	35	1	18	3	1	505	231	51	0	8	6	14	.321	.364	.501	.865	79	16.3	.370	129	18.7
23	Mike Morgan M. Morgan	38	1998	TOT	6	8	1	5	1	0	0	0	0	0	3	0	0	9	6	1	1	0	0	0	.625	.625	.750	1.375	3	2.1	.606	281	2.1
24	Charlie O'Brien C. O'Brien	38	1998	TOT	62	175	13	45	9	0	4	18	10	2	33	0	0	193	66	13	3	3	0	3	.257	.300	.377	.677	19	-5.3	.298	76	-6
25	Tim Raines T. Raines	38	1998	NYY	109	321	53	93	13	1	5	47	55	3	49	8	3	382	123	19	0	3	1	5	.290	.395	.383	.778	55	7.4	.355	112	6.2