LeBron James is the 8th youngest in a game with 40+ points. He was 19 years and 364 days old against the Hawks on December 28, 2004.

who is the 8th youngest player to score 40 points in a game
Interpreted as:
Who is the 8th youngest player to score 40 or more points in a regular-season game?
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3/27/2004James4/16/2008Durant3/18/2021Edwards5/5/2021Edwards3/30/2004Anthony11/24/2004James3/9/1980Robinson12/28/2004James10/22/1974Drew1/23/2009Gordon11/16/1974Drew11/14/2009Jennings12/8/2008Durant12/6/1947Braun3/20/2005James3/28/2005James12/13/2019Jackson12/28/1974Drew11/10/2021Edwards4/9/2005James1/23/2009Durant2/17/2009Durant19-08819-20019-22519-27319-30619-33019-36219-36420-02220-02920-04720-05220-07020-07220-08020-08820-08920-08920-09720-10020-11620-141
NAMEDATETMOPPAGEPTSMINREBASTSTLBLKTOVFGMFGAFG%3PM3PA3P%FTMFTAFT%PF+/-
LeBron JamesLeBron James3/27/2004CLECLEvsNJNNJN19-0884143613302152951.71250.01010100.01+10
Kevin DurantKevin Durant4/16/2008SEASEA@GSWGSW19-2004243136125182572.01250.05683.30+14
Anthony EdwardsAnthony Edwards3/18/2021MINMIN@PHXPHX19-225423873202153148.441330.881361.52+9
Anthony EdwardsAnthony Edwards5/5/2021MINMINvsMEMMEM19-273423867113172277.38988.9010.04+11
Carmelo AnthonyCarmelo Anthony3/30/2004DENDENvsSEASEA19-306414450214192965.52366.711100.05+3
LeBron JamesLeBron James11/24/2004CLECLEvsDETDET19-330433865313152268.22366.7111291.73+12
Cliff RobinsonCliff Robinson3/9/1980NJNNJNvsDETDET19-3624536104192867.916785.73
LeBron JamesLeBron James12/28/2004CLECLE@ATLATL19-364404697101132552.03560.0111478.62+8
John DrewJohn Drew10/22/1974ATLATLvsPHIPHI20-02241351813152951.7111764.74
Eric GordonEric Gordon1/23/2009LACLACvsOKCOKC20-029414424102121963.25771.4121485.740
John DrewJohn Drew11/16/1974ATLATLvsNOJNOJ20-04744392055162080.0121675.05
Brandon JenningsBrandon Jennings11/14/2009MILMILvsGSWGSW20-052554155004213461.87887.56875.01+11
Kevin DurantKevin Durant12/8/2008OKCOKCvsGSWGSW20-0704144104134152755.661060.055100.030
Carl BraunCarl Braun12/6/1947NYKNYK@PROPRO20-07247183551.411
LeBron JamesLeBron James3/20/2005CLECLE@TORTOR20-0805648105204183650.061250.0141593.30-7
LeBron JamesLeBron James3/28/2005CLECLE@NOHNOH20-0884453634010162955.231030.091181.83+1
Jaren Jackson Jr.Jaren Jackson Jr.12/13/2019MEMMEMvsMILMIL20-089432951013142166.791560.06966.75-5
John DrewJohn Drew12/28/1974ATLATLvsLALLAL20-0894039257122450.0161984.24
Anthony EdwardsAnthony Edwards11/10/2021MINMIN@GSWGSW20-097484265206162759.371353.891275.01-3
LeBron JamesLeBron James4/9/2005CLECLEvsMILMIL20-10040471010213152657.771353.833100.02+13
Kevin DurantKevin Durant1/23/2009OKCOKC@LACLAC20-1164646154212102343.52633.3242692.33-7
Kevin DurantKevin Durant2/17/2009OKCOKCvsNOHNOH20-141474332002162759.34666.7111384.63+1
Devin BookerDevin Booker3/24/2017PHXPHX@BOSBOS20-145704586315214052.541136.4242692.33-6
Trae YoungTrae Young3/1/2019ATLATLvsCHICHI20-1634956816119173351.561346.291181.82-9
Luka DoncicLuka Doncic11/18/2019DALDALvsSASSAS20-26342351112005142751.951338.591369.25+11