Apple’s support pages spell out, in exact words, when a Mac or iPhone becomes vintage or obsolete for hardware service. No equivalent document exists for software. How long an OS version keeps receiving security fixes, or how long Apple keeps signing it, is something Apple has never published as a stated policy.
That gap between what Apple writes down and what can only be observed by watching its pages over time is the actual story here. This piece reports the pattern as a pattern, and says plainly where Apple has published nothing at all.
Key facts
| Term | Apple’s published definition | What it governs |
|---|---|---|
| Vintage | “Stopped distributing for sale more than 5 and less than 7 years ago” | Hardware service and parts availability |
| Obsolete | “Stopped distributing for sale more than 7 years ago” | Hardware service and parts availability |
| Software support lifetime | Not published | Not applicable; no document exists |
| Signing window for an older OS version | Not published | Not applicable; no document exists |
What Apple does define, in writing
Apple’s vintage and obsolete page, last updated August 31, 2026, states its definitions in exact years: a product is vintage when Apple “stopped distributing them for sale more than 5 and less than 7 years ago,” and obsolete when that gap passes 7 years. Both terms govern hardware service and parts at Apple and its authorized providers. Apple wrote a number down, in public, for hardware. Nothing comparable exists for software.
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What Apple does not define
Apple publishes no policy document describing how long it continues to sign an older iOS or macOS version. There is no stated number of years, no stated number of releases, and no page that uses the word “signing” the way the vintage page uses the word “vintage.” The only visible evidence that older versions keep working at all is the security releases index itself, which lists what has been patched, not what will be.
The only going back document Apple publishes, and it is not for this
Apple’s one public document about returning to an earlier OS version lives at beta.apple.com/restore and applies only to beta software. It states that to use a previously released version, a device must be erased and restored “from the backup that you created before you installed the beta,” and that the backup “must be from your current OS version, or an OS version that precedes the beta.” Apple Watch cannot be restored to a previously released version once a beta is installed at all, a flat rule stated on the same page. None of this describes moving between two public releases; Apple publishes no downgrade path for public software at all. The table below lines up what each document actually covers.
| Document | What it actually covers | What it does not cover |
|---|---|---|
| beta.apple.com/restore | Reverting a beta install using a backup made before that beta | Moving between two public OS releases |
| Support article 108811 | Restoring a backup that needs a newer OS first | Restoring a device to an older OS after upgrading |
| Vintage and obsolete page | Hardware service eligibility, by exact year range | Software update eligibility of any kind |
The trap runs the other way too
Apple’s support article 108811, last updated December 19, 2025, documents the mirror case: restoring a backup can require updating to a newer OS first. Apple’s own wording says “an error might appear saying that you can’t restore the backup” and that “the system might ask you to update your software.” So Apple has documented the newer-direction friction in detail, while the older-direction question, going back after an upgrade, is not addressed anywhere in Apple’s published material, not as a warning against it and not as a procedure. It is a gap Apple has simply never filled, on either iPhone 18 Pro, iPhone Duo, or any older device running toward iOS 27 this Monday.
What Apple has not said
Apple has not published a support-lifetime commitment for any OS branch, has not defined a signing window for any older version, and has not published a downgrade procedure for any public release. Everything about how long a version keeps being useful is visible only by watching its own security index over time, the way this piece and its companion coverage of Apple’s current branches have done, not by reading a policy page that does not exist.
As of Saturday, September 12, 2026, no such policy page has appeared on Apple’s support site. Anyone weighing whether to move between OS versions should treat the absence itself as the answer and check support.apple.com/en-us/100100 for what is currently being patched, rather than wait for a commitment Apple has not made.
