Well, it's 6/19/2017 and 32-bit machines are still available, including OEM boards. However, they're mostly being marketed as workhorse Client machines (not home desktops) whereas the Host is 64-bit and most of the local network is connected to 32-bit Clients with remote controlled security. Some independent financial businesses still use such of a setup, because tightwads won't upgrade their external devices and virtual software.
I've been using the same 64-bit machine for nearly 10 years, but I've never ran a 64-bit OS on it. Even right now I'm using Windows 10 Pro 32-bit and Legacy BIOS with just a 64-bit dual-core AMD Athlon 2.3 Ghz server CPU, and it still runs satisfactory and quick. In fact, I have a buddy which is always trying to 'keep up with the Jones' and have the best computer, but couldn't understand why my hunk of junk would boot Windows 10 faster than his 10-core Intel rig. I chuckled and gave a rhetorical twist with, "That's the special power of AMD, sucka'", but then I explained to him my board is limited to optimum performance of only a 32-bit OS because I can't install more than 4 GB of RAM, so there's really no point in using a 64-bit OS on it.
But, I'm sure once my current rig blows up, if it ever does, I'll be using a 100% 64-bit machine and OS.... but I'll still be sticking with "that special power of AMD, sucka'", LOL.