Phil Niekro was the oldest in 1984. He was 45 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	Phil Niekro P. Niekro	45	1984	NYY
2	Pete Rose P. Rose	43	1984	TOT	121	374	43	107	15	2	0	34	40	3	27	1	1	421	126	17	3	1	4	11	.286	.359	.337	.696	47	0.5	.319	101	0.3
3	Tony Perez T. Perez	42	1984	CIN	71	137	9	33	6	1	2	15	11	0	21	0	0	149	47	9	0	1	2	8	.241	.295	.343	.638	13	-3.7	.285	73	-4.5
4	Tommy John T. John	41	1984	CAL
5	Jerry Koosman J. Koosman	41	1984	PHI	36	74	2	8	0	0	0	3	1	0	23	0	0	89	8	0	14	0	0	3	.108	.120	.108	.228	-5	-14.4	.106	-45	-14.5
6	Ron Reed R. Reed	41	1984	CWS	2	1	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	.000	.000	.000	.000	0	-0.2	.000	-115	-0.3
7	Tom Burgmeier T. Burgmeier	40	1984	OAK
8	Joe Morgan J. Morgan	40	1984	OAK	116	365	50	89	21	0	6	43	66	1	39	8	3	438	128	27	0	6	4	6	.244	.356	.351	.707	51	2.4	.325	105	2.5
9	Lou Piniella L. Piniella	40	1984	NYY	29	86	8	26	4	1	1	6	7	0	5	0	0	93	35	6	0	0	1	7	.302	.355	.407	.762	12	1.7	.341	114	1.5
10	Rusty Staub R. Staub	40	1984	NYM	78	72	2	19	4	0	1	18	4	0	9	0	0	79	26	5	0	3	3	1	.264	.291	.361	.652	6	-2.7	.273	71	-2.6
11	Jim Bibby J. Bibby	39	1984	TEX
12	Steve Carlton S. Carlton	39	1984	PHI	34	84	8	16	2	0	1	10	2	0	20	0	0	89	21	3	3	0	0	1	.190	.209	.250	.459	2	-7.4	.209	25	-7.5
13	Davey Lopes D. Lopes	39	1984	TOT	88	247	37	63	12	1	9	36	37	1	41	15	0	290	104	22	2	3	1	8	.255	.351	.421	.772	39	6.8	.348	120	6.6
14	Tug McGraw T. McGraw	39	1984	PHI	25	3	0	1	0	0	0	0	0	0	0	0	0	3	1	0	0	0	0	0	.333	.333	.333	.667	0	0	.303	89	0
15	Jose Morales J. Morales	39	1984	LAD	22	19	0	3	0	0	0	0	1	0	2	0	0	20	3	0	0	0	1	0	.158	.200	.158	.358	0	-2.7	.143	-16	-2.6
16	Graig Nettles G. Nettles	39	1984	SDP	124	395	56	90	11	1	20	65	58	5	55	0	0	465	163	32	0	7	4	12	.228	.329	.413	.742	57	5.3	.332	112	6.5
17	Joe Niekro J. Niekro	39	1984	HOU	38	83	4	11	0	0	0	6	2	0	21	0	0	96	11	0	11	0	0	0	.133	.153	.133	.285	-3	-13.5	.134	-22	-13.2
18	Tom Seaver T. Seaver	39	1984	CWS
19	Don Sutton D. Sutton	39	1984	MIL
20	Larry Bowa L. Bowa	38	1984	CHC	133	391	33	87	14	2	0	17	28	0	24	10	4	423	105	16	3	1	5	4	.223	.274	.269	.542	24	-23.2	.246	44	-26.8
21	Rod Carew R. Carew	38	1984	CAL	93	329	42	97	8	1	3	31	40	0	39	4	3	378	116	12	5	4	1	8	.295	.367	.353	.720	46	3.9	.331	105	2.3
22	Reggie Jackson R. Jackson	38	1984	CAL	143	525	67	117	17	2	25	81	55	3	141	8	4	584	213	44	1	0	7	10	.223	.300	.406	.706	64	-1.3	.315	94	-3.8
23	Jay Johnstone J. Johnstone	38	1984	CHC	52	73	8	21	2	2	0	3	7	0	18	0	0	80	27	4	0	0	4	2	.288	.350	.370	.720	8	-0.6	.308	86	-1.2
24	Hal McRae H. McRae	38	1984	KCR	106	317	30	96	13	4	3	42	34	1	47	0	3	361	126	20	0	9	3	10	.303	.363	.397	.760	46	6.1	.339	110	4.1
25	Rick Monday R. Monday	38	1984	LAD	31	47	4	9	2	0	1	7	8	0	16	0	0	57	14	3	2	0	3	0	.191	.309	.298	.607	4	-2.4	.264	66	-2.1