Not until much later. One of the defects of this forum is that the posting-date info is way over to the right and in faint type, so it’s much less noticeable than it should be. I might propose that threads over 6 months be locked automatically, and request that instead of “reply” for such threads, a “thread continuation” button appear which makes it obvious that an ancient thread is being continued.
In addition to an OS being twice as bulky, there’s twice as much code for the vendor to maintain and test, so it’s unsurprising that they are keen to remove the older one ASAP.