Well, many people will keep using 32bit because:
A. ) New hardware costs money.
B. ) Even if it was free some would never change.
As for the memory advantage, some older PCs do not have 64 CPUs. But hey do have the PAE feature,m which allows more memory if the OS supports it.
Windows 8 32 bit supports PAE. So it is possible to have 6 GB in an OS theat only directly reads 3 GB of memory.
Override the 4GB memory barrier on 32-bit Windows 8.1 systems.Although the 64-bit transition period has come and gone, there are a surprising number of active installations of the 32-bit Windows operating system, particularly in industrial or business environments. One plausible explanation is the fact that backwards compatibility with older 16-bit Windows code is not possible on 64-bit Window
My laptop is 32 bit and I an not ready to toss it out.