Not to muddy the waters on this subject, and though it is true that the 32bit convention has a projected absolute termination date, the last projected one I was aware of (MS, Solaris, etc.) was 2038. This end of all things 32bit is partially based on the projected amount of necessary data left to convert. At this point in time Windows still runs many many 32bit programs in a sub-system in its 64bit OS because the conversion work is far from done, and at the enterprise data level work is only partially begun. Linux has always been ahead of the curve in general, so it should be no surprise that the end of 32bit forever will come about a little quicker for Linux than for MS. It is unlikely that Debian will continue a stable 32bit image beyond Debian 10. Obviously, not unlike me, aging machines and systems will run until they drop, but nothing new will be built to accommodate the continuation of their usefulness, though some will be lovingly maintained by collectors and sold at auctions for fifty times their original worth. Entropy, inflation, and boredom make useless things rise in value. The thing is; unlike automobiles, old computers won't be collected for their speed. 32bit is over.
TC