Nolan Ryan is the oldest in a no-hitter. He was 44 years and 90 days old against the Blue Jays on May 1, 1991.

Interpreted as:

oldest player to throw a regular-season no hitter

	NAME	AGE	NH	DATE	TM		OPP	DEC	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP
1	Nolan Ryan N. Ryan	44-090	1	5/1/1991	TEX	vs	TOR	W	1	0.00	16	1	1	0	9.0	0	0	0	0	2	0	0	0	29	0
2	Nolan Ryan N. Ryan	43-131	1	6/11/1990	TEX	@	OAK	W	1	0.00	14	1	1	0	9.0	0	0	0	0	2	0	0	0	29	0
3	Cy Young C. Young	41-093	1	6/30/1908	BOS	@	NYH	W	1		2	1	1	0	9.0	0		0	0	1	0	0		27	0
4	Randy Johnson R. Johnson	40-251	1	5/18/2004	ARI	@	ATL	W	1	0.00	13	1	1	0	9.0	0	0	0	0	0	0	0	0	27	0
5	Warren Spahn W. Spahn	40-005	1	4/28/1961	MIL	vs	SFG	W	1	0.00	5	1	1	0	9.0	0	0	0	0	2	0	0	0	27	0
6	Sal Maglie S. Maglie	39-152	1	9/25/1956	BKN	vs	PHI	W	1	0.00	3	1	1	0	9.0	0	0	0	0	2	1	0	0	29	0
7	Warren Spahn W. Spahn	39-146	1	9/16/1960	MIL	vs	PHI	W	1	0.00	15	1	1	0	9.0	0	0	0	0	2	0	0	0	29	0
8	Cy Young C. Young	37-037	1	5/5/1904	BSA	vs	PHA	W	1	0.00	8	1	1	0	9.0	0	0	0	0	0	0	0		27	0
9	Bob Keegan B. Keegan	37-016	1	8/20/1957	CWS	vs	WSH	W	1	0.00	1	1	1	0	9.0	0	0	0	0	2	0	0	0	28	0
10	David Cone D. Cone	36-197	1	7/18/1999	NYY	vs	MON	W	1	0.00	10	1	1	0	9.0	0	0	0	0	0	0	0	0	27	0
11	Justin Verlander J. Verlander	36-193	1	9/1/2019	HOU	@	TOR	W	1	0.00	14	1	1	0	9.0	0	0	0	0	1	0	0	0	28	0
12	Dennis Martinez D. Martinez	36-075	1	7/28/1991	MON	@	LAD	W	1	0.00	5	1	1	0	9.0	0	0	0	0	0	0	0	0	27	0
13	Bob Gibson B. Gibson	35-278	1	8/14/1971	STL	@	PIT	W	1	0.00	10	1	1	0	9.0	0	0	0	0	3	0	0	0	31	1
14	Virgil Trucks V. Trucks	35-121	1	8/25/1952	DET	@	NYY	W	1	0.00	8	1	1	0	9.0	0	0	0	0	1	0	0	0	30	0
15	Hoyt Wilhelm H. Wilhelm	35-056	1	9/20/1958	BAL	vs	NYY	W	1	0.00	8	1	1	0	9.0	0	0	0	0	2	0	0	0	28	0
16	Corey Kluber C. Kluber	35-039	1	5/19/2021	NYY	@	TEX	W	1	0.00	9	1	1	0	9.0	0	0	0	0	1	0	0	0	28	0
17	Virgil Trucks V. Trucks	35-019	1	5/15/1952	DET	vs	WSH	W	1	0.00	7	1	1	0	9.0	0	0	0	0	1	2	0	0	31	0
18	David Wells D. Wells	34-362	1	5/17/1998	NYY	vs	MIN	W	1	0.00	11	1	1	0	9.0	0	0	0	0	0	0	0	0	27	0
19	Nolan Ryan N. Ryan	34-238	1	9/26/1981	HOU	vs	LAD	W	1	0.00	11	1	1	0	9.0	0	0	0	0	3	0	0	0	30	1
20	Allie Reynolds A. Reynolds	34-230	1	9/28/1951	NYY	vs	BSA	W	1	0.00	9	1	1	0	9.0	0	0	0	0	4	0	0	0	30	0
21	Dazzy Vance D. Vance	34-193	1	9/13/1925	BKN	vs	PHN	W	1	0.00	9	1	0	0	9.0	0	0	1	0	1	0	0		29	0
22	Wade Miley W. Miley	34-175	1	5/7/2021	CIN	@	CLE	W	1	0.00	8	1	1	0	9.0	0	0	0	0	1	0	0	0	29	0
23	Allie Reynolds A. Reynolds	34-152	1	7/12/1951	NYY	@	CLE	W	1	0.00	4	1	1	0	9.0	0	0	0	0	3	0	0	0	29	0
24	Phil Niekro P. Niekro	34-126	1	8/5/1973	ATL	vs	SDP	W	1	0.00	4	1	1	0	9.0	0	0	0	0	3	0	0	0	32	0
25	Hisashi Iwakuma H. Iwakuma	34-122	1	8/12/2015	SEA	vs	BAL	W	1	0.00	7	1	1	0	9.0	0	0	0	0	3	0	0	0	29	0