Cliff Robinson is the youngest in a game with 45+ points. He was 19 years and 362 days old against the Pistons on March 9, 1980.

youngest player to score 45 points in a single game
Interpreted as:
youngest player to score 45 or more points in a single regular-season game
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3/9/1980Robinson11/14/2009Jennings12/6/1947Braun3/20/2005James11/10/2021Edwards1/23/2009Durant2/17/2009Durant3/24/2017Booker3/1/2019Young12/10/2005James2/16/1993O'Neal4/29/2021Porter11/30/2016Towns1/14/2006James1/21/2006James12/4/2017Booker11/29/2019Young3/12/2006James3/29/2006James4/1/2006James12/21/2019Young1/31/2010Durant19-36220-05220-07220-08020-09720-11620-14120-14520-16320-34520-34720-36021-01521-01521-02221-03521-07121-07221-08921-09221-09321-124
NAMEDATETMOPPAGEPTSMINREBASTSTLBLKTOVFGMFGAFG%3PM3PA3P%FTMFTAFT%PF+/-
Cliff RobinsonCliff Robinson3/9/1980NJNNJNvsDETDET19-3624536104192867.916785.73
Brandon JenningsBrandon Jennings11/14/2009MILMILvsGSWGSW20-052554155004213461.87887.56875.01+11
Carl BraunCarl Braun12/6/1947NYKNYK@PROPRO20-07247183551.411
LeBron JamesLeBron James3/20/2005CLECLE@TORTOR20-0805648105204183650.061250.0141593.30-7
Anthony EdwardsAnthony Edwards11/10/2021MINMIN@GSWGSW20-097484265206162759.371353.891275.01-3
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
LeBron JamesLeBron James12/10/2005CLECLE@MILMIL20-345524377203192965.55955.691090.05-3
Shaquille O'NealShaquille O'Neal2/16/1993ORLORL@DETDET20-3474649213056192576.00081650.05
Kevin Porter Jr.Kevin Porter Jr.4/29/2021HOUHOUvsMILMIL20-3605041511015162661.591560.091181.85+19
Karl-Anthony TownsKarl-Anthony Towns11/30/2016MINMINvsNYKNYK21-0154742182134152268.2030.0172085.02+7
LeBron JamesLeBron James1/14/2006CLECLE@PHXPHX21-015464478101182864.35862.555100.01-5
LeBron JamesLeBron James1/21/2006CLECLE@UTAUTA21-022514358203193554.34850.091181.84+19
Devin BookerDevin Booker12/4/2017PHXPHX@PHIPHI21-035463981213173253.15862.57887.51+10
Trae YoungTrae Young11/29/2019ATLATL@INDIND21-071494316209162857.181553.399100.01+1
LeBron JamesLeBron James3/12/2006CLECLE@MIAMIA21-072474574015112740.71616.7242885.72-7
LeBron JamesLeBron James3/29/2006CLECLEvsDALDAL21-089464354302162369.64757.1101376.93+16
LeBron JamesLeBron James4/1/2006CLECLEvsMIAMIA21-0924745129204162564.02633.3131492.93+13
Trae YoungTrae Young12/21/2019ATLATL@BKNBKN21-093474086105143046.731225.0161984.21+5
Kevin DurantKevin Durant1/31/2010OKCOKCvsGSWGSW21-1244540112204162176.22366.71111100.02+13
Trae YoungTrae Young1/26/2020ATLATLvsWASWAS21-1294539614105132454.261154.5131681.32+22
Trae YoungTrae Young2/9/2020ATLATLvsNYKNYK21-1434848113207133043.361346.21616100.01+10
Antoine WalkerAntoine Walker1/7/1998BOSBOS@WASWAS21-1484942120105213658.355100.02728.66+2