Wait, what did 'XP' stand for?
Is your PC among the 40.7% still running Windows XP. This archaic, outdated operating system was released in October 2001. To show you how long ago that is (and to make you feel old), ten and a half years before that was April 1991, when Windows 3.0 was Microsoft's reigning operating system.
With such a large installed base, it's a good bet that an article like this one written ten years from now will include "ancient x86 box running Windows XP" in its rogues gallery.