Indeed, a good example of copying off each other!
Intel’s Core Duo would be the last major consumer line from Intel. 64 bit has been around a while but the transition doesn’t matter to a lot of people as it hasn’t impacted their daily usage and of course until a few years ago 64 bit operating systems were far from the norm for home users.
32 bit Atoms were around up through a couple years ago at least, IIRC.
edit: actually they weren’t really the norm, but they were finally pretty mature and more have transitioned to them over time although I still see lots of 64 bit capable systems (basically everything now) shipping with 32 bit OS’s.