Here are the Age of Empires III: Definitive Edition System Requirements (Minimum)
CPU: Intel i3-2105 @ 3.1GHz or AMD Phenom II X4 975 with an average CPU Passmark score of 3735 or better
CPU SPEED: Info
RAM: 8 GB
VIDEO CARD: GeForce GT 430, Radeon HD 5570, or Intel HD 4400 with an average Passmark G3D Mark of 570 or better
PIXEL SHADER: 5.0
VERTEX SHADER: 5.0
OS: Windows 10 version 18362.0 or higher
FREE DISK SPACE: 42 GB

Age of Empires III: Definitive Edition Recommended Requirements
CPU: Intel i5-3330 @ 3.0GHz or AMD FX-8350 or equivalent with an average CPU Passmark score of 4100 or better
CPU SPEED: Info
RAM: 16 GB
VIDEO CARD: GeForce GTX 980 or Radeon R9 Fury or equivalent with an average Passmark G3D Mark of 9500 or better
DEDICATED VIDEO RAM: 4096 MB
PIXEL SHADER: 5.1
VERTEX SHADER: 5.1
OS: Windows 10 version 18362.0 or higher
FREE DISK SPACE: 42 GB