Windows 10 is nearing its end.

Take a look at https://endof10.org to see what you can do, and read https://news.opensuse.org/2025/07/23/urgency-to-switch-builds/ for news on the matter.

I recommend openSUSE myself. I use the KDE window manager on more recent systems and XFCE on older systems.

Oldest sysyem in use at the moment is a Thinkpad dating back to 2011.