LeBron James has the most games by a player younger than 23 in the playoffs with 30+ points, with 14 games.

most 30 point games in the playoffs by players under age 23

Interpreted as:

most 30 or more point games in the playoffs by players under age 23

NAME	GP	PTS	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	REB	AST	STL	BLK	TOV	PF	+/-
LeBron James	14	489	47.4	34.9	7.9	7.1	1.4	0.3	3.6	12.3	24.1	51.0	2.1	4.9	42.6	8.3	11.1	74.4	663	111	100	20	4	50	43	+32
Amar'e Stoudemire	11	389	41.5	35.4	12.0	1.0	0.7	2.0	3.0	12.3	22.4	54.9	0.0	0.2	0.0	10.8	13.5	79.9	456	132	11	8	22	33	38	+27
Anthony Edwards	10	373	41.9	37.3	6.1	5.0	1.8	1.6	2.7	13.0	24.3	53.5	4.2	9.5	44.2	7.1	8.2	86.6	419	61	50	18	16	27	24	+64
Kobe Bryant	10	360	43.7	36.0	7.1	4.0	2.0	0.7	3.2	13.2	26.5	49.8	1.6	3.3	48.5	8.0	9.8	81.6	437	71	40	20	7	32	33	+80
Trae Young	8	289	39.0	36.1	3.4	8.8	1.5	0.0	3.9	11.9	25.5	46.6	3.6	9.4	38.7	8.8	9.9	88.6	312	27	70	12	0	31	16	+8
Luka Doncic	8	325	41.3	40.6	9.3	10.8	1.3	0.5	6.0	15.3	28.5	53.5	4.8	10.6	44.7	5.4	8.6	62.3	331	74	86	10	4	48	22	+19
Kevin Durant	8	292	43.6	36.5	8.5	2.4	1.4	1.6	3.1	11.3	22.1	50.8	2.9	6.6	43.4	11.1	12.6	88.1	349	68	19	11	13	25	22	+29
Derrick Rose	8	284	42.3	35.5	4.3	8.0	0.9	0.5	2.9	12.1	25.4	47.8	1.3	4.3	29.4	10.0	11.4	87.9	338	34	64	7	4	23	17	+45
Kareem Abdul-Jabbar	7	254	44.0	36.3	16.7	4.7				14.3	24.1	59.2				7.7	10.9	71.1	308	117	33				20
Ja Morant	6	224	39.8	37.3	6.8	8.2	2.3	0.0	3.3	12.3	24.8	49.7	2.7	7.2	37.2	10.0	13.0	76.9	239	41	49	14	0	20	14	-10
Tracy McGrady	6	213	46.3	35.5	7.5	6.8	1.2	2.0	3.0	12.5	27.8	44.9	1.2	3.8	30.4	9.3	11.5	81.2	278	45	41	7	12	18	18	-34
Jayson Tatum	5	160	40.2	32.0	10.0	4.6	1.0	1.0	2.0	9.6	20.8	46.2	4.2	9.2	45.7	8.6	9.4	91.5	201	50	23	5	5	10	12	+66
Russell Westbrook	5	162	42.7	32.4	5.4	5.2	1.8	0.8	4.2	11.6	26.8	43.3	0.8	3.6	22.2	8.4	9.2	91.3	214	27	26	9	4	21	19	+7
Tyrese Maxey	4	135	41.0	33.8	4.3	1.5	0.5	0.3	0.3	12.3	21.8	56.3	4.5	9.3	48.6	4.8	5.8	82.6	164	17	6	2	1	1	5	+42
Donovan Mitchell	4	136	40.2	34.0	6.0	3.8	1.3	0.5	3.0	11.8	26.8	43.9	3.8	8.8	42.9	6.8	8.3	81.8	161	24	15	5	2	12	13	+24
Dirk Nowitzki	4	138	43.3	34.5	11.3	1.8	1.8	0.5	1.5	11.0	20.0	55.0	1.8	4.8	36.8	10.8	12.3	87.8	173	45	7	7	2	6	13	+16
Paolo Banchero	3	108	36.3	36.0	12.7	3.7	1.3	0.3	3.3	12.3	26.0	47.4	3.7	7.3	50.0	7.7	9.3	82.1	109	38	11	4	1	10	8	+25
Chris Paul	3	97	40.1	32.3	3.3	13.0	2.7	0.3	1.7	12.0	19.7	61.0	0.3	1.7	20.0	8.0	9.7	82.8	120	10	39	8	1	5	10	+63
Deron Williams	3	96	40.5	32.0	4.3	8.3	2.7	0.3	3.0	11.3	21.0	54.0	3.3	5.7	58.8	6.0	7.3	81.8	121	13	25	8	1	9	12	+14
Marques Johnson	3	102	38.3	34.0	13.0	1.7	0.3	2.3	0.3	13.3	21.0	63.5				7.3	9.3	78.6	115	39	5	1	7	1	7
Moses Malone	3	93	44.0	31.0	21.0	0.0		0.7		11.3	19.3	58.6				8.3	12.3	67.6	132	63	0		2		9
Bob McAdoo	3	122	46.7	40.7	14.7	1.7				17.3	32.7	53.1				6.0	7.0	85.7	140	44	5				15
Jordan Poole	2	61	33.8	30.5	4.5	6.0	0.0	1.0	3.5	10.5	16.5	63.6	5.0	8.5	58.8	4.5	5.0	90.0	68	9	12	0	2	7	6	+17
Jamal Murray	2	68	46.3	34.0	7.0	4.5	0.5	0.0	3.0	12.0	26.0	46.2	3.5	9.5	36.8	6.5	6.5	100.0	93	14	9	1	0	6	3	+16
Jaylen Brown	2	64	37.3	32.0	6.5	1.0	1.5	0.0	1.0	12.5	23.0	54.3	5.0	10.0	50.0	2.0	3.0	66.7	75	13	2	3	0	2	4	+27