Re: Thinks Bubble
The last vaguely mainstream 32-bit CPU Intel released was in, I believe, 2006. There were 32-bit Atom CPUs up to 2010, by the looks of things, but those were pretty niche-y and you're probably not going to have an awesome experience running a full-fat modern distro on one of those in any case. Almost any 32-bit x86 system you have, in other words, must be at least 6 years old and is far more likely to be over 10 years old. That's really pretty old.
The weird Atom tablets / convertibles from the last few years have 64-bit CPUs but 32-bit firmwares; they don't actually need 32-bit distributions, it's possible for 64-bit distributions to run on them with a bit of nifty bootloader footwork.