NVIDIA recently warned that the end was nigh for GeForce support on 32-bit operating systems, and it has now put dates to that event. It will halt GeForce GPU driver support at the end of April, meaning users will lose access to new GeForce Experience features and game ready updates.
Moreover, NVIDIA will end security updates by January 2019, so continuing to use your 32-bit OS with a GeForce card beyond that date could actually put it at risk.
There's probably still a fair few folks using 32-bit versions of Windows or Linux, despite the fact that a 64-bit version of Windows XP was released on October 25th, 2001. I doubt that many of those are gamers, but there's always that person who only plays certain games "and they run just fine so why should I change?"