Just passed on my only Intel procesor machine - second hand, from my father - and the last of the 32 bit machines (because my daughter's netbook is elsewhere at the moment, running XP unti April 8th)
It's probably about ten years since I first bought a 64 bit machine and I've had and passed on quite a few machines but this does feel like the end of an era.
I still have 32 bit ARM machines - like most of the world - but I'm more than confident that, as soon as I can get hold of a 64 bit ARM, Debian will run from day one.
There is a Compaq 386SX laptop in the garage somewhere - it ran Debian 2.0 and still would if I plugged it in and the disk spun up. 4MB of memory and an 80M disk, It was installed from floppies - that seems so long ago now. We've come a long way in the last 19 years and should be proud of it