who was the last 18 year old or younger to play in mlb

Roberto Rivera was 18 years and 299 days old against the Astros on September 20, 1995.

	NAME	DATE	Age	TM		OPP	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP
1	Roberto Rivera R. Rivera	9/20/1995	18-299	CHC	@	HOU	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
2	Roberto Rivera R. Rivera	9/17/1995	18-296	CHC	@	SDP	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
3	Roberto Rivera R. Rivera	9/16/1995	18-295	CHC	@	SDP	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
4	Roberto Rivera R. Rivera	9/12/1995	18-291	CHC	vs	LAD	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
5	Roberto Rivera R. Rivera	9/9/1995	18-288	CHC	vs	SFG	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
6	Roberto Rivera R. Rivera	9/6/1995	18-285	CHC	vs	COL	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
7	Roberto Rivera R. Rivera	9/3/1995	18-282	CHC	@	ATL	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
8	Alex Rodriguez A. Rodriguez	7/26/1994	18-364	SEA	@	DET	3	0	1	0	0	0	0	0	0	1	0	0	3	1	0	0	0	0	0
9	Alex Rodriguez A. Rodriguez	7/24/1994	18-362	SEA	@	BOS	2	0	0	0	0	0	1	0	0	1	0	0	3	0	0	0	1	0	0
10	Alex Rodriguez A. Rodriguez	7/23/1994	18-361	SEA	@	BOS	2	0	1	0	0	0	0	0	0	0	0	0	2	1	0	0	0	0	0
11	Alex Rodriguez A. Rodriguez	7/23/1994	18-361	SEA	@	BOS	5	0	1	0	0	0	0	0	0	2	0	0	5	1	0	0	0	0	0
12	Alex Rodriguez A. Rodriguez	7/22/1994	18-360	SEA	@	BOS	4	2	2	0	0	0	0	0	0	1	1	0	4	2	0	0	0	0	0
13	Alex Rodriguez A. Rodriguez	7/18/1994	18-356	SEA	vs	BAL	3	0	0	0	0	0	0	1	0	2	0	0	4	0	0	0	0	0	0
14	Alex Rodriguez A. Rodriguez	7/17/1994	18-355	SEA	vs	NYY	3	0	1	0	0	0	0	1	0	1	0	0	4	1	0	0	0	0	0
15	Alex Rodriguez A. Rodriguez	7/16/1994	18-354	SEA	vs	NYY	3	0	1	0	0	0	1	1	0	0	0	0	4	1	0	0	0	0	0
16	Alex Rodriguez A. Rodriguez	7/15/1994	18-353	SEA	vs	NYY	4	1	1	0	0	0	0	0	0	2	0	0	5	1	0	1	0	0	0
17	Alex Rodriguez A. Rodriguez	7/14/1994	18-352	SEA	vs	NYY	4	1	1	0	0	0	0	0	0	0	1	0	4	1	0	0	0	0	0
18	Alex Rodriguez A. Rodriguez	7/10/1994	18-348	SEA	@	BOS	4	0	0	0	0	0	0	0	0	3	0	0	4	0	0	0	0	0	0
19	Alex Rodriguez A. Rodriguez	7/9/1994	18-347	SEA	@	BOS	4	0	2	0	0	0	0	0	0	1	1	0	4	2	0	0	0	0	0
20	Alex Rodriguez A. Rodriguez	7/8/1994	18-346	SEA	@	BOS	3	0	0	0	0	0	0	0	0	0	0	0	3	0	0	0	0	0	0
21	Jose Rijo J. Rijo	5/10/1984	18-363	NYY	vs	CLE
22	Jose Rijo J. Rijo	5/2/1984	18-355	NYY	@	CWS
23	Jose Rijo J. Rijo	4/28/1984	18-351	NYY	vs	MIL
24	Jose Rijo J. Rijo	4/26/1984	18-349	NYY	@	MIN
25	Jose Rijo J. Rijo	4/22/1984	18-345	NYY	vs	TEX

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Results may be incomplete. StatMuse has complete game-level data for player age going back to the 1908 season.

Some of the information used here was obtained free of charge from Retrosheet.

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Sun 9/27	CHC	@	BOS	3:05 PM
Tue 9/29	CHC	@	SDP	4:00 AM
Wed 9/30	CHC	@	SDP	4:00 AM
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Roberto Rivera was 18 years and 299 days old against the Astros on September 20, 1995.

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