Microsoft has been mainly telling consumers that Windows 11 is meant for newer PCs. However, an internet user has uploaded a video that shows the OS can actually run on a 15-year-old Pentium 4 chip from Intel.
Source: https://www.pcmag.com/news/no-new-pc-needed-windows-11-runs-on-a-15-year-old-intel-pentium-4-chip