5 players are tied for the youngest with 20.0+ points per game in a season. They were 19 years old. The first three are Zion Williamson in 2019-20, Luka Doncic in 2018-19 and Kevin Durant in 2007-08.

youngest player to average 20 points per game in a season
Interpreted as:
youngest player to average 20 or higher points per game in a season
2019-20Williamson2018-19Doncic2007-08Durant2003-04Anthony2003-04James2022-23Green2022-23Banchero2021-22Edwards2021-22Ball2020-21Williamson2019-20Doncic2016-17Booker2015-16Wiggins2013-14Davis2012-13Irving2009-10Evans2008-09Durant2004-05Anthony2004-05James1999-00Brand1992-93O'Neal2022-23Edwards19191919192020202020202020202020202020202021
NAMESEASONTMGPAGEPPGMPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Zion WilliamsonZion Williamson2019-20
NOPNOP
241922.527.86.32.10.70.42.58.815.058.30.30.642.94.87.464.0668540150501695942+62
Luka DoncicLuka Doncic2018-19
DALDAL
721921.232.27.86.01.10.33.47.016.542.72.37.132.74.86.771.32,3181,5265634297725247137-118
Kevin DurantKevin Durant2007-08
SEASEA
801920.334.64.42.41.00.92.97.317.143.00.72.628.84.95.687.32,7681,6243481927875232122-651
Carmelo AnthonyCarmelo Anthony2003-04
DENDEN
821921.036.56.12.81.20.53.07.617.942.60.82.632.25.06.477.72,9951,7254982279741247225+65
LeBron JamesLeBron James2003-04
CLECLE
791920.939.55.55.91.60.73.57.918.941.70.82.729.04.45.875.43,1221,65443246513058273149-144
Jalen GreenJalen Green2022-23
HOUHOU
152021.734.54.33.30.70.32.97.717.942.82.97.737.13.54.380.051732565501154323-121
Paolo BancheroPaolo Banchero2022-23
ORLORL
112023.534.68.33.60.70.93.08.117.546.11.03.925.66.48.376.938125991408103326-26
Anthony EdwardsAnthony Edwards2021-22
MINMIN
722021.334.34.83.81.50.62.67.617.344.13.08.435.73.13.978.62,4661,53334327510546190164+188
LaMelo BallLaMelo Ball2021-22
CHACHA
752020.132.36.77.61.60.43.37.216.742.92.97.538.92.83.287.22,4221,50850157111930245237+99
Zion WilliamsonZion Williamson2020-21
NOPNOP
612027.033.27.23.70.90.62.710.417.061.10.20.629.46.08.769.82,0261,6474412265739167135+89
Luka DoncicLuka Doncic2019-20
DALDAL
612028.833.69.48.81.00.24.39.520.646.32.88.931.67.09.275.82,0471,7595735386214260153+253
Devin BookerDevin Booker2016-17
PHXPHX
782022.135.03.23.40.90.33.17.818.342.31.95.236.34.75.783.22,7311,7262492687221241242-226
Andrew WigginsAndrew Wiggins2015-16
MINMIN
812020.735.13.62.01.00.62.27.316.045.90.72.330.05.37.076.12,8451,6752911647846182165-67
Anthony DavisAnthony Davis2013-14
NOPNOP
672020.835.210.01.61.32.81.67.815.051.90.00.122.25.26.679.12,3581,39467310589189109200-112
Kyrie IrvingKyrie Irving2012-13
CLECLE
592022.534.73.75.91.50.43.28.218.145.21.84.739.14.24.985.52,0481,3252163508921191146-176
Tyreke EvansTyreke Evans2009-10
SACSAC
722020.137.25.35.81.50.43.07.416.245.80.52.025.54.86.574.82,6771,45038041410926216204-334
Kevin DurantKevin Durant2008-09
OKCOKC
742025.339.06.52.81.30.73.08.918.847.61.33.142.26.17.186.32,8851,8714822059653225134-501
Carmelo AnthonyCarmelo Anthony2004-05
DENDEN
752020.834.85.72.60.90.43.07.116.443.10.62.126.66.17.679.62,6081,5584261946830224229+166
LeBron JamesLeBron James2004-05
CLECLE
802027.242.47.47.22.20.73.39.921.147.21.43.935.16.08.075.03,3882,17558857717752262146+152
Elton BrandElton Brand1999-00
CHICHI
812020.137.010.01.90.81.62.87.816.148.20.00.00.04.56.668.52,9991,62781015566132228259-647
Shaquille O'NealShaquille O'Neal1992-93
ORLORL
812023.437.913.91.90.73.53.89.016.156.20.00.00.05.38.959.23,0711,8931,12215260286307321
Anthony EdwardsAnthony Edwards2022-23
MINMIN
152121.936.25.83.91.10.32.98.217.546.82.77.336.42.84.365.654332887581744445+31
RJ BarrettRJ Barrett2021-22
NYKNYK
702120.034.55.83.00.60.22.27.017.140.82.05.834.24.15.871.42,4171,4024082084316151142-146
Luka DoncicLuka Doncic2020-21
DALDAL
662127.734.38.08.61.00.54.39.820.547.92.98.335.05.27.173.02,2621,8305275676436281152+164
Jayson TatumJayson Tatum2019-20
BOSBOS
662123.434.37.03.01.40.92.38.418.645.02.97.140.33.84.781.22,2651,5474602009357155136+501