Zorin OS 16 Lite is a great Linux-based Windows 11 alternative for older PCs
I'm a big fan of Windows 11, and I highly recommend it. With that said, the operating system has a huge problem -- it is incompatible with many older computers. This is by design, as Microsoft purposely blocks some older hardware. While there are ways to bypass the compatibility check, Microsoft can close them at any time, including possibly blocking future updates. It just isn't worth the hassle, folks. Ultimately, if the Windows 11 installer says your PC is incompatible, you should either stay on Windows 10 while it is supported or switch to Linux.
If you want to switch to Linux but don't know which operating system to choose for your aging PC, I have a suggestion. Released today, Zorin OS 16 Lite should be an excellent Linux-based Windows 11 alternative for older computers. The distribution is based on Ubuntu 20.04.3 LTS and uses Xfce 4.16 as its desktop environment; it should seem very familiar to Windows users. The lightweight distro comes with great software pre-installed so beginners can start using their computer right away. It even offers a simple way to install and run Windows programs!