Phil Niekro is the oldest in a complete game. He was 48 years and 85 days old against the Twins on June 25, 1987.

Interpreted as:

oldest player to record a regular-season complete game

	NAME	AGE	CG	DATE	TM		OPP	DEC	GS	ERA	SO	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP
1	Phil Niekro P. Niekro	48-085	1	6/25/1987	CLE	@	MIN	L	1	4.50	6	0	0	8.0	8	4	4	3	1	0	0	1	33	1
2	Phil Niekro P. Niekro	48-056	1	5/27/1987	CLE	@	BOS	L	1	1.13	3	0	0	8.0	4	1	1	0	4	0	0	0	30	1
3	Jamie Moyer J. Moyer	47-199	1	6/5/2010	PHI	vs	SDP	W	1	2.00	1	0	0	9.0	7	2	2	0	1	0	0	0	34	0
4	Phil Niekro P. Niekro	47-171	1	9/19/1986	CLE	@	OAK	L	1	5.63	1	0	0	8.0	9	5	5	1	0	0	0	0	33	1
5	Jamie Moyer J. Moyer	47-170	1	5/7/2010	PHI	vs	ATL	W	1	0.00	5	1	0	9.0	2	0	0	0	0	0	0	0	28	0
6	Phil Niekro P. Niekro	47-099	1	7/9/1986	CLE	@	CWS	W	1	3.00	3	0	0	9.0	6	3	3	0	0	1	0	0	33	0
7	Phil Niekro P. Niekro	47-094	1	7/4/1986	CLE	vs	KCR	W	1	3.00	2	0	0	9.0	8	3	3	1	1	0	0	0	36	0
8	Phil Niekro P. Niekro	47-082	1	6/22/1986	CLE	@	MIN	W	1	1.00	4	0	0	9.0	2	1	1	0	0	1	0	0	31	0
9	Phil Niekro P. Niekro	47-064	1	6/4/1986	CLE	@	BOS	L	1	6.75	6	0	0	8.0	8	6	6	3	2	1	0	0	35	0
10	Phil Niekro P. Niekro	46-188	1	10/6/1985	NYY	@	TOR	W	1	0.00	5	1	0	9.0	4	0	0	0	3	0	0	0	32	0
11	Phil Niekro P. Niekro	46-170	1	9/18/1985	NYY	@	DET	L	1	5.63	5	0	0	8.0	11	5	5	3	4	0	0	0	38	0
12	Phil Niekro P. Niekro	46-165	1	9/13/1985	NYY	vs	TOR	L	1	0.00	5	0	0	9.0	8	0	3	0	4	0	0	0	38	1
13	Charlie Hough C. Hough	46-160	1	6/14/1994	FLA	@	STL	W	1	0.00	9	1	0	9.0	5	0	0	0	1	1	0	0	33	0
14	Phil Niekro P. Niekro	46-133	1	8/12/1985	NYY	@	CWS	W	1	3.00	7	0	0	9.0	7	3	4	2	1	0	0	0	34	0
15	Phil Niekro P. Niekro	46-111	1	7/21/1985	NYY	@	MIN	W	1	2.00	4	0	0	9.0	7	2	2	1	3	0	0	0	35	0
16	Phil Niekro P. Niekro	46-098	1	7/8/1985	NYY	vs	KCR	L	1	4.00	5	0	0	9.0	8	4	5	2	4	0	0	0	38	0
17	Satchel Paige S. Paige	46-075	1	9/20/1952	SLA	vs	CWS	W	1	0.00	5	1	0	9.0	8	0	0	0	4	1	0	0	39	0
18	Jack Quinn J. Quinn	46-063	1	9/2/1929	PHA	vs	NYY	W	1	3.00	1	0	0	9.0	11	3	3	0	0	0	0		36	0
19	Satchel Paige S. Paige	46-056	1	9/1/1952	SLA	vs	CLE	W	1	1.80	4	0	0	5.0	3	1	1	0	2	0	0	0	19	0
20	Phil Niekro P. Niekro	46-052	1	5/23/1985	NYY	@	SEA	L	1	6.75	3	0	0	8.0	7	6	6	2	3	0	0	0	34	0
21	Jack Quinn J. Quinn	46-043	1	8/13/1929	PHA	@	DET	W	1	2.00	4	0	0	9.0	8	2	3	1	1	0	0		36	0
22	Satchel Paige S. Paige	46-030	1	8/6/1952	SLA	vs	DET	W	1	0.00	9	1	0	12.0	7	0	0	0	2	0	0	0	44	0
23	Bobo Newsom B. Newsom	46-020	1	8/31/1953	PHA	@	DET	W	1	1.00	4	0	0	9.0	11	1	4	1	3	0	0	0	43	0
24	Jack Quinn J. Quinn	46-003	1	7/4/1929	PHA	vs	BSA	W	1	1.00	1	0	0	9.0	8	1	1	1	1	0	0		33	0
25	Jack Quinn J. Quinn	45-356	1	6/22/1929	PHA	@	NYY	L	1	2.63	2	0	0	13.2	18	4	4	0	4	0	0		59	0